Still an improvement from before but not a solution.I know there have been a few posts related to this but I found no one definitive answer to solve our issues. Same for the USB/ A 3.1 gen 2 port, except it is capped at 20 MB/s so unusable. I updated the host controller driver with an ASMedia driver google found on Dell's website (details below) for a comparable system, and all the above problems with the USB/C port went away except the transfer speed is capped at 636 MB/s. Host controller was using a generic windows driver. The manufacturers do not offer drivers for the USB device or the host controller. This box says I need to include my windows version number: Windows 10 (20H2) Perhaps a motherboard issue? Or other thoughts? Sorry if I don't respond right away, going to sleep and then busy day tomorrow but I will be coming back here later tomorrow or I guess today now. I also tried uninstalling the host driver and updating, no change. I also tried three different USB 3.2 cables, all same issues (except the USB A cable is worse in terms of I can never see the drive. I also tried plugging the SSD into the PC directly via PCiE and the SSD works fine, no errors, no system freezes. I tried the USB enclosure in a different PC with a USB 3.1 gen 2 port, and it works fine, no errors logged, and it gets close to 1,000 MB/S transfer speed. My desktop also has type A and C USB 3.0 ports (Intel USB 3.0 eXtensible controller) and everything works fine, no issues, except that the transfer speed is capped at the USB 3.0 limit of 5 Gbit/s (so real world 440 MB/S).

Dell asmedia root hub driver