After winding new bobbin I began having trouble. Needle breaks, needle thread fraying, bobbin thread breaks; threads are so fine 50 in needle and bottom line in bobbin. After tweaking tension it is sewing better but is making a popping or hitting sound when I pull the machine towards me. I've quit for the night and am worried it's going to break another needle. It is better if I slow down, but is dense quilting I'm doing. Also, I am in manual mode. I have an appointment for maintenance next week but hate to not work for six days.... Any ideas? I know I should do my own maintenance but who has time to learn another thing? I be too busy learning creative stuff! TIA!