e46 window working intermitently

Hi all, Have problem with window in driver's door - works intermittently - goes all the way up and down - so don't think it's the regulator. Also it doesn't seem to be the switch either as the window doesn't go down
using the key either. Probably the motor? Has anybody else had similar problems??? It's a 2002 316 model. Also is it an expensive job?
Cheers, Keith

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