Wireless mouse interference.
I thought I had some sort of resources problem on a laptop computer. I don't get on well with a touchpad, so use a wireless mouse instead. The mouse would behave peculiarly or even stop working altogether when an external USB drive was plugged into the laptop's second USB port. No real problem, just use a wired mouse when the USB drive is plugged in.
I got more intrigued when this happened on my main computer. I use a powered USB hub with this and the wireless mouse receiver is plugged into it. When a USB 3.0 external drive was also plugged into the hub, the mouse stopped working.
Curiosity caused an Internet search that brought up these results...
https://cybertext.wordpress.com/2020...stops-working/
https://www.intel.com/content/www/us...nce-paper.html
The second link leads to a PDF that is technical but what it amounts to is that, if an external drive is plugged into more or less the same location as a wireless mouse, it
might interfere with mouse's operation. In my case the problem was overcome by taking the mouse receiver out of the USB hub and plugging it into a USB port on the computer. I haven't tried it but I'd think a similar cure would work with the laptop computer. Perhaps plug one or the other device in via a USB hub.
Just something worth knowing about maybe.