gettoelf858 posted an answer for this Bernina Sewing Machines:
"your motor is going out. time to replace or rebuild your motor. both are high skill and..."
gettoelf858 posted an answer for this Brother LS-1520 Mechanical Sewing Machine:
"your machine is most likely "gummy". when sewing machines sit the oils get sticky,..."
gettoelf858 posted an answer for this PfaFF Creative 7570:
"is your service shop a certified pfaff scervice center? if not take it to one. your part..."