I'm not sure this is on-topic on this site. If not, please let me know and delete it!

It's highly likely that your wifi uses 2.45 GHz and, it may or may not surprise you to know that microwave ovens use exactly the same part of the spectrum hence, with circa 750 watts of microwaves being produced inside the oven (and a few tens of milli watts leaking out) that leakage scatter guns the part of the spectrum your wifi uses.

Thanks, @Andyaka

@msh210 Your hunch is correct about off-topic. When we get a site that covers computer hardware from user's or IT's perspective, this question would fit there very well. I would move this question there when such a site appear on Codidact, and the system allows us to migrate questions.

@Nick Alexeev Really? This is a great question, falls within EMI field. This question closing fetish should stay on ee.stackexchange.

You have a wonderfully informative post, and it is just shut down. And it does not disappear, it is just shut for people to add more information. Currently we have people that are very experienced here and can add great value, and yet the decision is made to close this. For what? This is just purely stupid.

This post is discussed on meta here.

I posted a more detailed version of this question here: https://electrical.codidact.com/q/278855. Is it on-topic now? Please comment in the linked meta thread.