Ladies OIL YOUR MACHINES! Had mine with a problem and oil cured it. Friends machine froze.
Oiled it...let it sit wiggled the wheel...oiled it again. Armed with oil, Qtips and paper towel I took it apart (bobbin and bottom). De fuzzed and oiled anything that moved...NO WIRES!......put it back together and she purrs like a kitten.
If your machine is broke and it may cost you$$$ take it apart.. after all it is already broke.
You might save some $$$$.