Log is below. I've been experiencing this for the last week or so. I can still watch a given channel by watching the in-progress recording, but this gets annoying especially when because I like to double-click the play/pause button to switch between channels instead of going to my Recordings page. Happens in both the tvOS beta and App Store versions. I am on the latest beta server release.
2020/02/13 06:00:00.024868 [DVR] Starting job 1581591600-105 New Day With Alisyn Camerota and John Berman on ch=[6032]
2020/02/13 06:00:00.610423 [TVE] stream timestamps: cnni: start_at=2020-02-13T05:49:50-05:00 current_at=2020-02-13T05:59:32-05:00 end_at=2020-02-13T05:59:44-05:00
2020/02/13 06:00:00.610486 [TNR] Opened connection to TVE-Comcast_SSO for ch6032 CNNI
2020/02/13 06:00:00.610598 [DVR] Starting job 1581591600-101 Morning Joe on ch=[6050]
2020/02/13 06:00:00.610626 [DVR] Waiting 59m59.389380566s until next job 1581595200-36 Today
2020/02/13 06:00:00.630341 [DVR] Recording for job 1581591600-105 from TVE-Comcast_SSO ch6032 into "TV/New Day With Alisyn Camerota and John Berman/New Day With Alisyn Camerota and John Berman 2018-06-03 2020-02-13-0600.mpg" for 1h59m59.973708911s
2020/02/13 06:00:00.684164 [IDX] Generating video index for job 1581591600-105
2020/02/13 06:00:01.603024 [TNR] Opened connection to TVE-ATTOTT for ch6050 MSNBC
2020/02/13 06:00:01.690793 [DVR] Recording for job 1581591600-101 from TVE-ATTOTT ch6050 into "TV/Morning Joe/Morning Joe 2020-02-13-0600.mpg" for 3h0m59.389346727s
2020/02/13 06:00:01.819195 [IDX] Generating video index for job 1581591600-101
2020/02/13 06:23:04.342184 [HLS] Stopping transcoder session ch6030-dANY-f0b33068ca57 (out: 28m53.838644s, finished: false)
2020/02/13 06:23:04.367425 [HLS] ffmpeg: ch6030-dANY-f0b33068ca57-remux: [mpegts @ 0x2764180] Dropped corrupted packet (stream = 1)
2020/02/13 06:23:04.537623 [TNR] Closed connection to TVE-Comcast_SSO for ch6030 CNN
2020/02/13 06:23:04.739601 [TNR] Sharing existing connection to TVE-ATTOTT for ch6050 MSNBC (clients=2, len=0)
2020/02/13 06:23:04.767379 [HLS] Starting transcoder for channel 6050 from 76.125.251.3 (encoder=remux, resolution=, deinterlacer=, bitrate=0)
2020/02/13 06:23:07.844880 [HLS] Probe failed for live stream after 3.077312527s and 0 bytes
2020/02/13 06:23:13.511798 [HLS] Session ch6050-dANY-f0b33068ca57 started in 8.78299538s
2020/02/13 06:23:13.515355 [HLS] Couldn't generate master playlist for ch6050-dANY-f0b33068ca57: Could not determine video format
2020/02/13 06:23:13.515402 [HLS] Stopping transcoder session ch6050-dANY-f0b33068ca57 (out: 0s, finished: false)
2020/02/13 06:39:23.074016 [TVE] stream timestamps: cnn: start_at=2020-02-13T06:29:12-05:00 current_at=2020-02-13T06:38:53-05:00 end_at=2020-02-13T06:39:04-05:00