That reminds me - do you have the console set to Quick Start in Power settings? If yes, turn that off as it can prevent the USB port from clearing the previous authentication handshake, leading to the unplug / plug merry-go-round.
I do, and I'll try that (thanks), but again.. this only started after updating xim 2 days ago. And the only button that doesn't work on the controller is the x button.
It's just the micro USB to controller connection that I had to unplug, so I'm not worried about that wear too much, but I'd like to not have to do it as it's never happened before in the many years I've been using it. Just seems odd it starred just after updating.
Edit : as per your suggestion, just looking at my settings now, this would be setting it to energy saver instead of standby mode? I don't see any other wording about quick startup like I thought there was before.