Can you hear a metal-to-metal "clunking" sounds at the beginning of the agitation cycle?
Remove the front panel. Locate the motor status LED on top of the motor, under the inverter plate. Watch how this LED is flashing and post the result.
Here are the breakdown diagrams and
Replacement parts for General Electric WHDSR316G1WW WASHER | AppliancePartsPros.com
Gene.