Frigidaire Ultraquiet III

Hello

I have had a Frigidaire Ultraquiet III dishwasher for about 4 years and up until now it has been a great machine. But now it will run its complete cycle and will get right before the dry cycle and stop it will continue to run in that place until we manually advance it to the dry cycle. I replaced the timer thinking that was the problem, but I installed the new timer and it does the same thing. It must be a communication problem between the timer and the cycle prior to the dry cycle. I'm about to give up.
Thanks for any help.