[feature requests! save window location, dark mode, tray!]

On the "minimize to tray" suggestion, many apps have this as a configurable option. qbittorrent for an open source example - in settings under Behavior, you can toggle to start the app minimized and also minimize and even close to notification tray. Default behavior could be left as-is.

[Drive(s) dropping from pool]

Ah that's a tough one. If the disks SMART readings are ok then my first guess would be the JBOD chassis power supply or other hardware failing. Disk failures are usually more slow moving in that you start to see errors and corruption and will get some warning from the pool. If it completely fails suddenly then a restart wouldn't bring it back.

[Drive(s) dropping from pool]

Are you using an AMD ryzen system and USB-connected JBOD? You could be having the USB disconnect issue that has affected a lot of users. It should be fixed by BIOS updates and newer chipset drivers depending on the mobo manufacturer but in my case everything is fully updated and I still have USB drive disconnects. I'm going to try adding a PCIE expansion card and connecting to that instead to see if the issue is fixed.