usb 3 hard drive enclosure

[dimme]

I just upgraded my Mac mini file server from a 2012 mini to a M1. I have 8 hard drives connected via USB3 and TB2. One of my dual USB 3 enclosures will unmount after 1 to 4 hours. I went through trouble shooting with OWC tech support and we could not find a solution. Over the weekend I got a OWC Gemini https://eshop.macsales.com/item/OWC/TB3DKP2D/. I have two WD RED 4TB drives as my Photo working drives. The unit is nice but I may send it back because my drives runs on the warm side, 40C. The fan is in the back and the drive bays are surrounded by metal so the fan is cooling the electronics and not the drives. My other OWC cases the same drives run at 28C. So for 24/7 I think I may want a cooler setup. Not sure what to look at next. The M1 mini is great but this USB problem is a pain. All my single bay enclosures work fine. Because I need so many drives I prefer to use dual enclosures.