Kenmore series 80 Model 110 24812200?

Hi my wifes machine will do six loads of wash fine and then on the 7th load it won't spin out the clothes. Tried varying the load tried waiting time to let machine cool down thinking it was an overheated motor N.G. Some loads work fine then the machine comes to an abrupt halt and the clothes are wet.
I called a reputable repair guy (independent) and he could not recreate the problem ran 3 loads with no proplem. He told me that my discharge line was kinda long and narrow. So I called a plummer and we installed a much shorter and bigger discharge line. Still no good although the clothes are not as wet as they used to be when the machine doesnt spin out.
Ive read alot about the lid switch being defective although I dont see my model number being reported any ideas ?
Thanks sorry for the long post