Hello! I recently picked this up at a thrift shop since I have always wanted to try one. I’ve used it 7 or 8 times and the last couple times the paddle would stop spinning to mix the ingredients. I thought it was due to gunk on the paddle or the inner container wasn’t inserted properly. This last time it mixed maybe two times and then would have an audible “click” sound instead of turning the paddle. Does anyone know how to fix the motor or attachment?