True, electrical interference can cause problems with electronics, as can RF (radio frequencies) which are also electro-magnetic waves just at a different set of frequencies. However, the K3 is most likely shielded to prevent this. My Kindles sit on my desk with two computers running and at least three ham radios. Even when I transmit with my HF radio using 100 watts I never have a problem with my Kindles.

If you want to test out your theory, place your Kindle in a Faraday box. You can build one out of a cardboard box and wrap aluminum foil all around it. That would protect your Kindle from a the EMP (electro-magnetic pulse) generated by a nearby nuclear explosion, so it will definitely shield it against household electrical interference. If you still encounter the problems then your theory is incorrect.

My guess is that the problem lies with firmware issues and not electro-magnetic interference.