Monitoring alert, Filesystem flags changed to readonly

Hello people!!!,

I am having a problem with my btrfs volume, when an indeterminate time passes, for example 24 hours, I receive a monit alert email with the following content:

Quote

[NAS.local] Monitoring alert -- Filesystem flags changed filesystem_srv_dev-disk-by-label-poolFS

Host: \NAS.local
Date: Mon, 17 Aug 2020 11:51:17
Service: filesystem_srv_dev-disk-by-label-poolFS
Event: Filesystem flags changed
Description: filesystem flags changed to ro,noatime,compress=zstd:3,space_cache,subvolid=5,subvol=/
This triggered the monitoring system to: alert

From this moment the file system appears as readonly and my containers that I have on this volume begin to fail. When I reboot the system returns to normal.

I scrubbed the volume and got the following message:

root@NAS:/srv/dev-disk-by-label-poolFS/@homeUsers/mlillo# btrfs scrub status /srv/dev-disk-by-label-poolFS/
scrub status for 0e696343-a445-481b-9f9f-0449d8ad65c3
        scrub started at Sun Aug 16 13:31:35 2020 and was aborted after 22:19:19
        total bytes scrubbed: 6.98TiB with 2 errors
        error details: super=1 csum=1
        corrected errors: 1, uncorrectable errors: 0, unverified errors: 0

Can anybody help me?

This has me a little desperate.

Thank you

Thank you!!!

I have already found the error, or so I think, it seems that one of the disks is giving an error.

Thank you very much for the help