Here having a same issue, came from this ticket:
I just wanted to share info about my motherboard is also "MSI MAG B760M MORTAR MAX WIFI (MS-7E01) Version 3.0".
There's "MAX" on mine but the model numbers are same.
Unraid logs and the results of "lsusb -vt" are same as well.
May 7 20:21:08 Unraid kernel: xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
May 7 20:21:14 Unraid kernel: xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
May 7 20:21:14 Unraid kernel: usb 2-2: device not accepting address 49, error -62
May 7 20:21:20 Unraid kernel: xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
May 7 20:21:25 Unraid kernel: xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
May 7 20:21:25 Unraid kernel: usb 2-2: device not accepting address 50, error -62
/: Bus 001.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/16p, 480M
ID 1d6b:0002 Linux Foundation 2.0 root hub
|__ Port 002: Dev 002, If 0, Class=Human Interface Device, Driver=usbhid, 12M
ID 1462:7e01 Micro Star International
Bus 001 Device 002 Port 1-2 ID 1462:7e01 Micro Star International MYSTIC LIGHT
So it looks like MSI Mystic Light + Unraid Connect makes a problem indeed.
I'm currently avoiding this issue by uninstalling Unraid Connect.