You also have to consider that it might not be you, and you neighbors instead. On the atom vs sp200 thread, Riya was having ac issues, and then also went to a friends house and had the same issues, but then went to return it and it was dead quiet at the store, so he just happened to have dirty power. You could have someone else also on your power lines affecting your power, just like how internet can slow down at certain times as it’s being used more
You can read from this on for the power issues if you are curious about that