Spoke too soon. Not working again. I noticed that I got the same message the other poster did that the update was ready (in my case 1701) and I needed to reboot. I did so and it's back to the old behavior. I did briefly get to a settings page and saw that it said the OS was up to date, but since then cannot go back to the settings page.
I'm trying to get it to generate diagnostic logs, but it won't complete. Here are the logs I can see starting with the downloading of new OS.
2021/04/28 10:15:19.853060 [SYS] Downloading new OS v2021.0428.1701
2021/04/28 10:15:22.233299 [SYS] Created database snapshot: backup-20210428.101521
2021/04/28 10:15:22.233967 [SYS] Removing old backup backup-20210415.103920
2021/04/28 10:15:43.178982 [SYS] Installing new OS v2021.0428.1701
2021/04/28 10:19:15.012707 [SYS] Starting Channels DVR v2021.04.22.1948 (linux-arm64 pid:830) in /mnt/data/channels-dvr/data
2021/04/28 10:19:15.302836 [SYS] Started HTTP Server
2021/04/28 10:19:16.070850 [HDR] Found 0 devices
2021/04/28 10:19:20.209620 [DVR] Recording engine started in /media/DVR
2021/04/28 10:19:20.444842 [SYS] Bonjour service running for dvr-server.local. [192.168.1.110]
2021/04/28 10:19:20.528572 [DVR] Skipping job 1619640000-33 Good Witch
2021/04/28 10:19:20.528652 [DVR] Waiting 4h40m39.471361176s until next job 1619647200-15 The Love Boat
2021/04/28 10:19:31.492478 [IDX] Pruned 0 expired airings from X-LOCAST in 48.95616ms.
2021/04/28 10:19:31.531250 [IDX] Pruned 1 expired airings from X-TVE in 38.561337ms.
2021/04/28 10:19:36.379725 [SYS] Created database snapshot: backup-20210428.101935
2021/04/28 10:19:36.380374 [SYS] Removing old backup backup-20210416.103930
2021/04/28 10:22:26.778852 [SYS] Shutting down...
2021/04/28 10:22:26.780117 [SYS] Bonjour service stopped.
2021/04/28 10:22:26.788895 [DVR] Recording engine stopped.
2021/04/28 10:22:27.789239 [SYS] Goodbye.
2021/04/28 10:22:32.247665 [SYS] Starting Channels DVR v2021.04.22.1948 (linux-arm64 pid:305) in /mnt/data/channels-dvr/data
2021/04/28 10:22:32.524633 [SYS] Started HTTP Server
2021/04/28 10:22:32.544432 [SYS] Waiting on dependencies network-online.target time-sync.target
2021/04/28 10:22:36.019731 [SYS] Waiting on dependencies time-sync.target
2021/04/28 10:23:25.982867 [SYS] Done waiting on dependencies
2021/04/28 10:23:26.421564 [HDR] Found 0 devices
2021/04/28 10:23:36.568684 [DVR] Recording engine started in /media/DVR
2021/04/28 10:23:36.570653 [SYS] Bonjour service running for dvr-server.local. [192.168.1.110]
2021/04/28 10:23:37.362629 [DVR] Skipping job 1619640000-33 Good Witch
2021/04/28 10:23:37.363091 [DVR] Waiting 4h36m22.637173542s until next job 1619647200-15 The Love Boat
2021/04/28 10:23:47.422811 [IDX] Pruned 0 expired airings from X-LOCAST in 20.386519ms.
2021/04/28 10:23:47.428140 [IDX] Pruned 0 expired airings from X-TVE in 4.934518ms.
2021/04/28 10:23:51.563487 [SYS] Created database snapshot: backup-20210428.102351
2021/04/28 10:23:51.564058 [SYS] Removing old backup backup-20210417.103940
2021/04/28 10:25:06.473817 [SYS] Starting Channels DVR v2021.04.22.1948 (linux-arm64 pid:307) in /mnt/data/channels-dvr/data
2021/04/28 10:25:06.645545 [SYS] Started HTTP Server
2021/04/28 10:25:06.670354 [SYS] Waiting on dependencies network-online.target time-sync.target
2021/04/28 10:25:10.480369 [SYS] Waiting on dependencies time-sync.target
2021/04/28 10:27:42.046211 [SYS] Done waiting on dependencies
2021/04/28 10:27:42.505398 [HDR] Found 0 devices
2021/04/28 10:27:49.835039 [DVR] Recording engine started in /media/DVR
2021/04/28 10:27:50.125440 [SYS] Bonjour service running for dvr-server.local. [192.168.1.110]
2021/04/28 10:27:50.214818 [DVR] Skipping job 1619640000-33 Good Witch
2021/04/28 10:27:50.215078 [DVR] Waiting 4h32m9.78496777s until next job 1619647200-15 The Love Boat
2021/04/28 10:28:11.448849 [IDX] Pruned 0 expired airings from X-LOCAST in 58.462185ms.
2021/04/28 10:28:11.572017 [IDX] Pruned 2 expired airings from X-TVE in 112.63387ms.
2021/04/28 10:29:21.807153 [SYS] Starting Channels DVR v2021.04.22.1948 (linux-arm64 pid:740) in /mnt/data/channels-dvr/data
2021/04/28 10:29:22.144953 [SYS] Started HTTP Server
2021/04/28 10:29:22.923816 [HDR] Found 0 devices
2021/04/28 10:29:26.089017 [DVR] Recording engine started in /media/DVR
2021/04/28 10:29:26.298080 [SYS] Bonjour service running for dvr-server.local. [192.168.1.110]
2021/04/28 10:29:26.381724 [DVR] Skipping job 1619640000-33 Good Witch
2021/04/28 10:29:26.381902 [DVR] Waiting 4h30m33.618122069s until next job 1619647200-15 The Love Boat
2021/04/28 10:29:38.923588 [IDX] Pruned 0 expired airings from X-LOCAST in 78.207735ms.
2021/04/28 10:29:38.971138 [IDX] Pruned 1 expired airings from X-TVE in 47.383528ms.
2021/04/28 10:29:43.927630 [SYS] Created database snapshot: backup-20210428.102943
2021/04/28 10:29:43.928540 [SYS] Removing old backup backup-20210418.103950
2021/04/28 10:31:10.649487 [SYS] Starting Channels DVR v2021.04.22.1948 (linux-arm64 pid:795) in /mnt/data/channels-dvr/data
2021/04/28 10:31:10.948518 [SYS] Started HTTP Server
2021/04/28 10:31:11.779465 [HDR] Found 0 devices
2021/04/28 10:31:16.101217 [DVR] Recording engine started in /media/DVR
2021/04/28 10:31:16.324447 [DVR] Skipping job 1619640000-33 Good Witch
2021/04/28 10:31:16.324521 [DVR] Waiting 4h28m43.675493203s until next job 1619647200-15 The Love Boat
2021/04/28 10:31:16.327312 [SYS] Bonjour service running for dvr-server.local. [192.168.1.110]
2021/04/28 10:31:26.771446 [IDX] Pruned 16 expired airings from X-LOCAST in 63.954851ms.
2021/04/28 10:31:26.919629 [IDX] Pruned 31 expired airings from X-TVE in 147.989468ms.
2021/04/28 10:31:29.356619 [SYS] Created database snapshot: backup-20210428.103128
2021/04/28 10:31:29.357767 [SYS] Removing old backup backup-20210419.104001
2021/04/28 10:32:36.986338 [TRS] DNS: OK: Resolved host via system DNS
2021/04/28 10:32:38.515553 [TRS] Cloud Reachable: OK: Connected to community.getchannels.com
2021/04/28 10:32:38.633166 [TRS] Local Time: OK: Local clock is accurate
2021/04/28 10:32:38.633404 [TRS] Remote Access: OK: Remote access not configured
2021/04/28 10:32:38.798468 [TRS] Disk Permissions: OK
it still just stops once it gets to the "Removing Old backup" place