My first thought goes to heat from the router, not microwaves. Or maybe they get disturbed more often by someone fiddling with the router.
Pseudoscience is generally when you have an explanation for something but no evidence, and generalize that theory to explain too much
So we can call it light science. Or amateur science?
People shouldn't be discouraged from practicing science.
I'm not discouraging anyone; in fact, I'm encouraging repeating the experiment with more rigour, that is calling for more science.