I returned a EQ12 with internal 2nd drive internal NVME issues and bought the EQR6. It had external USB3 connected NVME issues.
The issues occurred across 3+ NVME sticks, and 3 USB/NVME adapters. It occurred with copies to NVME from Explorer, with Partition Manager, and with HDClone Utility. Some issues were
USB Device malfunctioned
Drive out of space errors
I/O Device Error
Very slow or stalled performance
System hanging
In desperation I downloaded the drivers, which in EQR6 was an RAR file with about 4 executable programs. I ran 3, including the AMD and Network set. The BT (bluetooth) was an earlier version. Since then I was able to copy and write via programs to the 2nd NVME drive both USB connected and now internally mounted. Error free now, thank goodness.
By the way, I made the stock v4.0 NVME into the second drive and used my 1T XPG Blade as primary since it is 40% faster. Removing and reinstalling the primary NVME was a bit tedious.