drive randomly un-mounts

running OMV on a raspberry pi 4 with 2 usb drives. since I don't access the drives regularly, might be 2 or 3 days without accessing, I'll frequently find that 1 drive, always the same one is not mounted, if I open the web UI, goto file systems, highlight the drive and click mount, it always does without any issues or errors. have used for hours without it dropping out, then when I try a few days later I find its not mounted again. including copy of of log entries not that I can make much out of it. would appreciate any advice or troubleshooting tips, please be specific, I'm not an expert with Linux, so if i need to run program x, then please include the entire syntax. I can follow instructions, I've been running OMV since the Pi 4 came out this has always been a problem thought maybe it was time to figure out why.