Indeed via snmp the value for memAvailReal looks to be wrong.
Last night I had a script running capturing the output of top every 30min, and see that actually buffers and cached is jumping up and down.
The crashes look to corelate with high buffers/cached memory usage, (and lower free memory value).
In the attached image you see MRTG graphs from the last ~3 days.
The spikes in the eth0 graph indicate the crashes of kodi (at startup of kodi there seem to be some information being downloaded).
(I have not yet looked at the reason for the re-appearing higher CPU usage each night between 2 and 6.)
# cat /tmp/statsdump_2020-11-21.log | grep "MiB Mem"
MiB Mem : 747.9 total, 269.1 free, 357.1 used, 121.8 buff/cache
MiB Mem : 747.9 total, 28.1 free, 357.8 used, 361.9 buff/cache
MiB Mem : 747.9 total, 34.6 free, 358.0 used, 355.2 buff/cache
MiB Mem : 747.9 total, 30.7 free, 328.4 used, 388.8 buff/cache
MiB Mem : 747.9 total, 29.9 free, 328.2 used, 389.8 buff/cache
MiB Mem : 747.9 total, 24.2 free, 327.0 used, 396.7 buff/cache
MiB Mem : 747.9 total, 31.6 free, 327.7 used, 388.6 buff/cache
MiB Mem : 747.9 total, 38.5 free, 358.4 used, 351.0 buff/cache
MiB Mem : 747.9 total, 37.2 free, 356.9 used, 353.8 buff/cache
MiB Mem : 747.9 total, 29.6 free, 327.5 used, 390.8 buff/cache
MiB Mem : 747.9 total, 28.9 free, 327.9 used, 391.1 buff/cache
MiB Mem : 747.9 total, 303.1 free, 324.8 used, 120.0 buff/cache
MiB Mem : 747.9 total, 302.9 free, 325.0 used, 120.0 buff/cache
MiB Mem : 747.9 total, 243.2 free, 325.3 used, 179.4 buff/cache
MiB Mem : 747.9 total, 242.9 free, 325.6 used, 179.4 buff/cache
MiB Mem : 747.9 total, 220.1 free, 326.5 used, 201.2 buff/cache
MiB Mem : 747.9 total, 220.3 free, 326.3 used, 201.2 buff/cache
MiB Mem : 747.9 total, 217.2 free, 327.0 used, 203.6 buff/cache
MiB Mem : 747.9 total, 217.1 free, 327.1 used, 203.6 buff/cache
MiB Mem : 747.9 total, 213.6 free, 327.2 used, 207.0 buff/cache
MiB Mem : 747.9 total, 213.6 free, 327.3 used, 207.0 buff/cache
MiB Mem : 747.9 total, 213.8 free, 326.5 used, 207.5 buff/cache
MiB Mem : 747.9 total, 214.1 free, 326.3 used, 207.5 buff/cache
MiB Mem : 747.9 total, 213.0 free, 326.7 used, 208.2 buff/cache
MiB Mem : 747.9 total, 212.7 free, 327.0 used, 208.2 buff/cache
MiB Mem : 747.9 total, 211.9 free, 327.2 used, 208.8 buff/cache
MiB Mem : 747.9 total, 211.9 free, 327.2 used, 208.8 buff/cache
MiB Mem : 747.9 total, 211.7 free, 327.3 used, 208.9 buff/cache
MiB Mem : 747.9 total, 211.2 free, 327.8 used, 208.9 buff/cache
MiB Mem : 747.9 total, 211.5 free, 327.5 used, 208.9 buff/cache
MiB Mem : 747.9 total, 211.5 free, 327.5 used, 208.9 buff/cache
MiB Mem : 747.9 total, 211.2 free, 327.7 used, 209.0 buff/cache
MiB Mem : 747.9 total, 211.1 free, 327.7 used, 209.0 buff/cache
MiB Mem : 747.9 total, 210.8 free, 327.8 used, 209.3 buff/cache
MiB Mem : 747.9 total, 210.8 free, 327.8 used, 209.3 buff/cache
MiB Mem : 747.9 total, 212.0 free, 326.5 used, 209.4 buff/cache
MiB Mem : 747.9 total, 212.1 free, 326.4 used, 209.4 buff/cache
MiB Mem : 747.9 total, 211.1 free, 327.2 used, 209.6 buff/cache
MiB Mem : 747.9 total, 210.3 free, 328.0 used, 209.6 buff/cache
MiB Mem : 747.9 total, 210.4 free, 327.6 used, 209.9 buff/cache
MiB Mem : 747.9 total, 210.6 free, 327.3 used, 209.9 buff/cache
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