To the repair shop -- BUT>>>>>>>
Hi...and welcome to the board.
You probably already know this, but i'm going to toss it out there anyway. My machine started to do exactly the same thing a few years ago - i took it to my local shop - and all that it needed was the lint cleaned out of the bobbin case. There was A LOT of lint. Dumb me - i was sewing faux suede at the time and just never thought of it. Just a thought.