Hi. I have a weird issue with my newly built PC, running Windows 10.

Basically, after plug in a USB device into the USB 3.0 ports in the back of my PC, I notice really high Kernel Times in Task Manager and I get really bad lag in games, and my single-threaded performance drops through the floor in benchmarks. I also notice "System Interrupts" at the top of the CPU usage list. (It's not usually there).

It's almost as if the Windows thread scheduler has bugged or something...

This doesn't happen when I use the USB 3.0 front panel ports or the USB 2.0 ports on the rear panel. Only the middle cluster of ports. The problem persists until I restart my PC.

Any ideas?

Thanks.

CPU: AMD Ryzen 7 1700 @ 3.92GHz
Motherboard: MSI X370 SLI PLUS