I found some of that strange Behavior as well.
SATA quad on RASPERRY PI4,with 2 HDD 2TB + 1 HDD 450GB + 1 HDD 750 GB, up and running since May 2020 with Raspian with OMV5.
As long as the RASPBERRY is in low activity over the day, all is fine for music for 2-3 Users, some data up an down . But as soon as you start copying larger amounts of data eg. Pictures, MP3, Mp4, or large 2GB .TGZ archive files to it at some position sometimes only some MB sometimes some GB into the job, the drives suddenly and at random seem to disconnect some times SSH login ist possible sometimes the Whole thing seems to be in a jammed mode. A reboot by pulling cable has helped always up to now and in most cases even a lossless resume (as far as I was able to trace this up to now) was possible, but this is a behavior that makes it unuseable as a essential component of a low cost almost green Server System and i can not really build up trust with it.
So I cron-reboot the whole thing every 24 Hrs by default and that has helped most for the moment. But this is not the idea -or is it?. A proper reset-button as well as a proper Power-down-Mode also wold be fine things to be added to the concept as pulling the power plug seems not to be the fine art of modern IT. Also this fancy cube has survived that rude handling quite robustly til now.
I was reading here some days ago that the “USB Double male Plug Bridge” might be the cause.
My question: Is there a confirmation for that? Might it be the Bridge- or the Quad-Firmware and if so where can I get a replacement. Or can I just order a sole bridge or two short male2male USB3.0 Type A cables if that is the solution and from where?