Check and see if there is a shear or safety pin in one of the drive pulleys that has broken.See if there is a pulley that turns by hand when this happens. Could be one has broken but grabs for a little bit. Also check the drive belt and see if it is slipping Check all the drive areas . BE SAFE BY TAKING THE KEY OUT AND TRYING BY HAND>
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Check and see if there is a shear or safety pin in one of the drive pulleys that has broken.See if there is a pulley that turns by hand when this happens. Could be one has broken but grabs for a little bit. Also check the drive belt and see if it is slipping Check all the drive areas . BE SAFE BY TAKING THE KEY OUT AND TRYING BY HAND>