The vent hood is quite old. For some reason when I flip the switch to turn it on it takes 10-30 seconds to actually turn on. I've checked it and there's no power flowing for those 10-30 seconds. There's no sound during that time or any indication of what's going on. At first I even thought it wasn't getting any power until it suddenly started after I'd left the switch on for a bit. I mean, its definitely not getting power for those few seconds but I thought it was a dead motor or something at first.
It always does this, even if it was just running. Turning it off and then on again will cause it to stop and take its time to turn on again.
I'm fairly decent at DIY household electricity, but I've never encountered a problem like this. It defies my basic understanding of electricity. I think it might be the switch but I don't know how to check for that and don't know what to do to replace the switch on an old stove range if it is.