You don't need something fancy like motor sparks to kill a 2.4Ghz WiFi, a leaky Microwave will do that and perfectly explain the 1 minute length. Switching to

You don't need something fancy like motor sparks to kill a 2.4Ghz WiFi, a leaky Microwave will do that and perfectly explain the 1 minute length. Switching to 5Ghz will help if this is the case