I too was bitten by Synology corrupted TM backups over SMB on WiFi and have stopped trying to back up since I have not found any good documentation on the cause or solution. Where do you store the backups? Did you change to a hardwired connection?
I'm not sure what causes TM to start considering the volume corrupted, because I believe at one point I switched over to a hardwired connection, but still saw a corrupted volume.
I compared that to Borg, which doesn't flinch if you SIGKILL the process mid-backup, and will basically just pick up from where it left off if you start another one. I saw no reason to continue with TM at all.