Concerning your microwave …
This is a common problem, not really on the Arylic side but on the microwave side. Microwaves transmit radiation on the 2.4Ghz frequency. That’s the same frequency that your WiFi is on, and therefor also your streaming equipment.
Especially older microwaves have this, as the older ones didn’t have good shielding.
You can easily find out by pulling the power plug of the microwave out, and check if the disturbances are gone. But maybe you already did so.
Newer microwaves have better shielding, so chances they influence your streaming are smaller.