How can I fix Kenmore 80 Series Washing Machine Model 110.26842690?

I have a Kenmore 80 Series Washing Machine, Model No. 110.2682690, Serial No CG 1320283. When I put the wash on 2 rinses, it frequently stops at the completion of filling the tub for the second rinse. By pushing and pulling the Stop/Set knob once, it will continue to the end of the wash. Once, I banged into the machine accidentally when it stopped at the 2nd rinse, it went on. Please tell me how to fix that glitch.