Originally Posted by crutledge
There are problems with Logitech Wireless and USB3 devices. Apparently the USB3 transmits in the same freq range as the Logitech Wireless but with much higher power thus causing interference with the Logitech Wireless. This study was done by Intel. As this was unknown, the computer manufacturers did not install sufficient sheilding. The only fix that has been devised is to move the LogiTech dongle as far as possible from the USB3 even to placing it at the end of a long usb extender cable.
This could be at least part of your problem.
Thanks for the information. It doesn't affect me right now because my system is too old to support USB3 and I have no USB3 devices. I will be building a new system later this year, so I'll take your advice into consideration then.