Channel 0 (0.5m) started hitting 7 Volts on 2023-08-25 at 9:42 UTC, or 2:42 last Friday morning local time. It was intermittent at first, but as of this morning it is continuous. Presumably a short has developed somewhere, likely in the probe. If there is a spare probe, then I think that's the first thing to try swapping out.
The first sign of a short in channel 0 seems to happen here:
(base) [daq@ustar ~]$ data_dump -i 200,510-513 -x hotfilm.xml /data/isfs/projects/M2HATS/raw_data/hotfilm_20230825_* |& egrep ' 7\.' 2023 08 25 09:42:43.1870 1 200, 510 12 2.1569 2.0216 7.2967 2023 08 25 09:46:02.1870 0 200, 512 12 1.8874 1.8348 7.2177 2023 08 25 10:10:30.1875 1 200, 510 12 2.007 1.8459 7.2689 2023 08 25 10:14:52.1875 0 200, 512 12 1.9778 1.7318 7.2174 2023 08 25 11:03:13.1880 1 200, 510 12 1.962 1.8282 7.2673 2023 08 25 22:21:08.2910 1 200, 510 12 2.3411 0.68967 7.2026 2023 08 25 22:21:31.2910 1 200, 510 12 2.3765 0.73897 7.2588 2023 08 25 22:21:48.2910 1 200, 510 12 2.4567 0.85462 7.1738 2023 08 25 22:21:55.2915 1 200, 510 12 2.3388 0.76678 7.2604 2023 08 25 22:22:04.2915 1 200, 510 12 2.5594 0.80248 7.091 2023 08 25 22:22:05.2915 1 200, 510 12 2.5424 0.7614 7.1185 2023 08 25 22:23:36.2915 1 200, 510 12 2.5616 0.74718 7.0755 2023 08 25 22:23:37.2915 1 200, 510 12 2.6161 0.74118 7.1119 2023 08 25 22:23:39.2915 1 200, 510 12 2.4647 0.78953 7.085 2023 08 25 22:23:44.2915 1 200, 510 12 2.4616 0.80912 7.225 2023 08 25 22:23:55.2915 1 200, 510 12 2.3531 1.0297 7.2455 2023 08 25 22:23:59.2915 1 200, 510 12 2.2909 0.75256 7.2955 2023 08 25 22:24:57.2920 1 200, 510 12 2.3089 0.76836 7.2838 2023 08 25 22:25:09.2920 1 200, 510 12 2.4819 1.54 7.1864
I didn't see any other problems with ch2 except for those two in the dump excerpt above, whereas ch0 keeps showing up intermittently at 7V over the following days. I don't know why the min goes close to zero, as if the bridge is disconnected, but the max is 7, normally indicating a short.