Background saving periodically fails

[GC-Elia]

With no logic changes on one specific VM that has been running months, redis background saving started failing periodically with:

1:M 23 Oct 2023 05:37:43.052 * 10000 changes in 60 seconds. Saving...
1:M 23 Oct 2023 05:37:43.058 * Background saving started by pid 31659
31659:C 23 Oct 2023 05:37:46.593 * DB saved on disk
31659:C 23 Oct 2023 05:37:46.597 * Fork CoW for RDB: current 5 MB, peak 5 MB, average 4 MB
1:M 23 Oct 2023 05:37:46.667 * Background saving terminated with success
1:M 23 Oct 2023 05:38:47.008 * 10000 changes in 60 seconds. Saving...
1:M 23 Oct 2023 05:38:47.013 * Background saving started by pid 31660
31660:C 23 Oct 2023 05:38:49.151 # Write error saving DB on disk(rdbSaveRio): No error information
1:M 23 Oct 2023 05:38:49.219 # Background saving error
1:M 23 Oct 2023 05:38:53.029 * 10000 changes in 60 seconds. Saving...
1:M 23 Oct 2023 05:38:53.034 * Background saving started by pid 31661
31661:C 23 Oct 2023 05:38:55.270 # Write error saving DB on disk(rdbSaveRio): No error information
1:M 23 Oct 2023 05:38:55.340 # Background saving error
1:M 23 Oct 2023 05:38:59.049 * 10000 changes in 60 seconds. Saving...
1:M 23 Oct 2023 05:38:59.054 * Background saving started by pid 31662
31662:C 23 Oct 2023 05:39:01.150 # Write error saving DB on disk(rdbSaveRio): No error information
1:M 23 Oct 2023 05:39:01.261 # Background saving error
1:M 23 Oct 2023 05:39:05.069 * 10000 changes in 60 seconds. Saving...
1:M 23 Oct 2023 05:39:05.074 * Background saving started by pid 31663

Looking for direction as to what may be going wrong here, since there's no error information provided..
Restarting the problematic redis instance/VM not helping.