I had some #UniversalSerialBus problems recently that I put down to power initially, which is why I was curious.
I've been having one on a #RaspberryPi that I originally thought was device hardware/hub issues, too. There are two HIDs plugged into a KVM, and both of them have extra buttons and keys above the norm.
I was fully ready to blame that for the problem, until I booted the Pi up without any USB connected at all and still the phantom keystrokes that were plaguing the bootstrap were appearing.
Must be software, then. (-:
I'm confident that the cheap and cheerful card reader from a computer fair years ago is genuinely crap in hardware, though. It has not worked when plugged in to several things, now.
I even tried putting the TF card into an adapter and putting it into the bigger slot.
