Older whirlpool unit model LSQ8512KQ0 Serial#CM0919568

Runs all cycles properly and completes wash with buzzer at end of wash cycle.

The problem is that it also sounds the buzzer mid cycle before the rinse cycle starts.

My home office is next to the laundry room so i have been monitoring it.

Every time it seems to buzz, fill for rinse, then move on to spin and buzz again when complete.

I am leaning towards a malfunction in the timer but wanted some input from more experienced appliance guru's!

THanks,
Aaron