For this reason I disconnect my sewing machine and computer from "any" electric circuit and I do use the big serge protectors. I had a friend with a small serge protector still take out the modem on his computer. So for me "when I leave the room" it's unplug".
I had a State Electrician tell me that the small serge protectors(4-5 plugs in it) that us sewers/quilters us doesn't not carry enough juice for our machines. We need to be using the bigger ones that have the 8 or more outlets in them and include a big heavy cord that is attached. Just a piece of "educated" information for everyone.