My DVR stopped recording Friday afternoon (Pacific time); logs contain the following (note that job 1621040400-1 never completed); I had to power cycle the Shield to resume normal behavior:
2021/05/14 15:48:48.973569 [DVR] Waiting 2h11m11.026443378s until next job 1621040400-1 The Rachel Maddow Show
2021/05/14 18:00:00.047731 [DVR] Starting job 1621040400-1 The Rachel Maddow Show on ch=[6050]
2021/05/14 18:00:00.053210 [DVR] Waiting 29m59.946922735s until next job 1621042200-7 NBA Basketball
2021/05/14 18:30:00.020303 [MTS] Statistics for "TV/MLB Baseball/MLB Baseball San Francisco Giants at Pittsburgh Pirates 2021-05-14-1530.mpg": skipped=0 unhandled_packets=0 discontinuity_detected=0 transport_errors=0 invalid_pts=0 invalid_dts=0 saw_pcr=true saw_pmt=true highest_pts=878.469911
2021/05/14 18:30:00.023830 [DVR] Marking expired job 1621031400-8 MLB Baseball
2021/05/14 18:48:48.422391 [DVR] Fetched guide data for XMLTV-Pluto in 0s
2021/05/14 18:49:04.324353 [DVR] Indexed 5582 airings into XMLTV-Pluto (321 channels over 26h45m0s) + 537 skipped [15s index]
2021/05/14 18:49:04.418079 [DVR] pruned 1474 replaced airings in 0s.
2021/05/14 18:49:04.460777 [IDX] Pruned 863 expired groups from XMLTV-Pluto in 42.515156ms.
2021/05/14 21:49:05.204791 [DVR] Fetched guide data for XMLTV-Pluto in 0s
2021/05/14 21:49:21.376993 [DVR] Indexed 5564 airings into XMLTV-Pluto (320 channels over 25h30m0s) + 544 skipped [15s index]
2021/05/14 21:49:21.472139 [DVR] pruned 1474 replaced airings in 0s.
2021/05/14 21:49:21.561727 [IDX] Pruned 860 expired groups from XMLTV-Pluto in 89.218645ms.
2021/05/14 23:00:02.674131 [WRN] Commercial detection took longer than 8 hours, aborting...
2021/05/15 00:49:22.230212 [DVR] Fetched guide data for XMLTV-Pluto in 0s
2021/05/15 00:49:43.076054 [DVR] Indexed 5573 airings into XMLTV-Pluto (320 channels over 28h30m0s) + 540 skipped [20s index]
2021/05/15 00:49:43.148002 [DVR] pruned 1450 replaced airings in 0s.
2021/05/15 00:49:43.191488 [IDX] Pruned 881 expired groups from XMLTV-Pluto in 43.322605ms.
2021/05/15 03:49:43.350478 [DVR] Fetched guide data for XMLTV-Pluto in 0s
2021/05/15 03:50:04.048622 [DVR] Indexed 5596 airings into XMLTV-Pluto (320 channels over 31h30m0s) + 548 skipped [19s index]
2021/05/15 03:50:04.149097 [DVR] pruned 1441 replaced airings in 0s.
2021/05/15 03:50:04.262749 [IDX] Pruned 853 expired groups from XMLTV-Pluto in 113.463229ms.
2021/05/15 06:50:04.467356 [DVR] Fetched guide data for XMLTV-Pluto in 0s
2021/05/15 06:50:23.931590 [DVR] Indexed 5081 airings into XMLTV-Pluto (320 channels over 34h30m0s) + 557 skipped [18s index]
2021/05/15 06:50:24.011288 [DVR] pruned 1462 replaced airings in 0s.
2021/05/15 06:50:24.050930 [IDX] Pruned 840 expired groups from XMLTV-Pluto in 39.488906ms.
2021/05/15 09:50:24.295520 [DVR] Fetched guide data for XMLTV-Pluto in 0s
2021/05/15 09:50:46.314493 [DVR] Indexed 5575 airings into XMLTV-Pluto (321 channels over 26h30m0s) + 552 skipped [21s index]
2021/05/15 09:50:46.546432 [DVR] pruned 1517 replaced airings in 0s.
2021/05/15 09:50:46.619406 [IDX] Pruned 987 expired groups from XMLTV-Pluto in 72.810313ms.
2021/05/15 12:50:53.906921 [DVR] Fetched guide data for XMLTV-Pluto in 0s
2021/05/15 12:51:15.519319 [DVR] Indexed 5541 airings into XMLTV-Pluto (321 channels over 25h15m0s) + 555 skipped [20s index]
2021/05/15 12:51:15.644248 [DVR] pruned 1473 replaced airings in 0s.
2021/05/15 12:51:15.682209 [IDX] Pruned 814 expired groups from XMLTV-Pluto in 37.783489ms.
2021/05/15 12:56:00.853045 [DVR] Commercial detection failed for Deadline White House S2021E95 2021-05-14-1300.mpg with signal: killed
2021/05/15 12:58:42.118237 [M3U8] Generator: consecutive_errors=5 err=cannot create temp file: open /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/Streaming/m3u8/93/stream.m3u8097746171: input/output error
2021/05/15 13:13:45.280575 [ERR] Could not create backup: mkdir /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/Database/backup-20210515.125528: input/output error
2021/05/15 13:16:26.560452 [ERR] Failed to start stream on channel 6050 via TVE-Hulu: TVE: mkdir /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/Streaming/channels-cache-989598598: input/output error
2021/05/15 13:16:26.560738 [DVR] Starting job 1621042200-7 NBA Basketball on ch=[6167 6140]
2021/05/15 13:16:26.560796 [DVR] Marking expired job 1621044000-2 The Last Word With Lawrence O'Donnell
2021/05/15 13:16:26.560956 [DVR] Error running job 1621042200-7 NBA Basketball: no time left: -16h16m26.560900259s
2021/05/15 13:16:26.578947 [DVR] Marking expired job 1621060490-11 The Late Show With Stephen Colbert
2021/05/15 13:16:26.584622 [DVR] Waiting 2h13m33.415391303s until next job 1621117800-8 MLB Baseball
2021/05/15 13:16:26.593074 [DVR] Marking expired job 1621040400-1 The Rachel Maddow Show
2021/05/15 13:16:26.598866 [DVR] Waiting 2h13m33.401141668s until next job 1621117800-8 MLB Baseball
2021/05/15 13:16:27.589066 [DVR] Waiting 2h13m32.410943439s until next job 1621117800-8 MLB Baseball
2021/05/15 13:16:58.816367 [DVR] Error running job 1621040400-1 The Rachel Maddow Show: could not start stream on channels=[6050]: TVE: mkdir /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/Streaming/channels-cache-989598598: input/output error
2021/05/15 13:16:59.832125 [DVR] Waiting 2h13m0.167885691s until next job 1621117800-8 MLB Baseball
2021/05/15 13:17:31.072121 [DVR] Deleting /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/TV/Morning Joe/Morning Joe S2021E95 2021-05-13-0300.mpg
2021/05/15 13:31:34.592210 [DVR] Deleting /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/TV/The Rachel Maddow Show/The Rachel Maddow Show S2021E90 2021-05-06-1800.mpg
2021/05/15 13:33:14.364504 [TNR] Closed connection to TVE-Hulu for ch6167 NBCSN-BAYAREA
2021/05/15 13:43:24.224441 [DVR] Finished job 1621031400-8 MLB Baseball
2021/05/15 13:43:24.241410 [DVR] Waiting 1h46m35.758599941s until next job 1621117800-8 MLB Baseball
2021/05/15 14:01:40.932215 [ERR] Could not create backup: mkdir /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/Database/backup-20210515.135755: input/output error
2021/05/15 14:01:40.933256 [DVR] Processing file-93: TV/MLB Baseball/MLB Baseball San Francisco Giants at Pittsburgh Pirates 2021-05-14-1530.mpg
2021/05/15 14:02:45.961381 [ERR] Could not probe file 93: exit status 1
2021/05/15 14:06:32.000191 [DVR] Deleting /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/TV/Deadline White House/Deadline White House S2021E94 2021-05-13-1300.mpg
2021/05/15 14:07:04.257467 [DVR] Deleting /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/TV/Morning Joe/Morning Joe S2021E95 2021-05-13-0300.mpg
2021/05/15 14:07:36.539529 [DVR] Deleting /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/TV/The Rachel Maddow Show/The Rachel Maddow Show S2021E90 2021-05-06-1800.mpg
2021/05/15 14:13:25.957107 [DVR] Commercial detection failed for MLB Baseball San Francisco Giants at Pittsburgh Pirates 2021-05-14-1530.mpg with mkdir /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/Logs/comskip/93: input/output error
2021/05/15 14:17:11.744448 [ERR] Could not create backup: mkdir /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/Database/backup-20210515.141116: input/output error
2021/05/15 14:17:11.756625 [DVR] Deleting /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/TV/Deadline White House/Deadline White House S2021E94 2021-05-13-1300.mpg
2021/05/15 14:17:11.757720 [DVR] Deleting /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/TV/Morning Joe/Morning Joe S2021E95 2021-05-13-0300.mpg
2021/05/15 14:17:11.778341 [DVR] Deleting /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/TV/The Rachel Maddow Show/The Rachel Maddow Show S2021E90 2021-05-06-1800.mpg
2021/05/15 14:20:57.536459 [ERR] Could not create backup: mkdir /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/Database/backup-20210515.141711: input/output error
2021/05/15 14:20:57.549274 [DVR] Deleting /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/TV/Deadline White House/Deadline White House S2021E94 2021-05-13-1300.mpg
2021/05/15 14:20:57.550340 [DVR] Deleting /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/TV/Morning Joe/Morning Joe S2021E95 2021-05-13-0300.mpg
2021/05/15 14:20:57.571455 [DVR] Deleting /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/TV/The Rachel Maddow Show/The Rachel Maddow Show S2021E90 2021-05-06-1800.mpg
2021/05/15 14:24:43.328452 [ERR] Could not create backup: mkdir /storage/62F0DDB6F0DD90A1/NVIDIA_SHIELD/DVR/Database/backup-20210515.142057: input/output error