Bosch Nexxt 700 Drain clogged message

[Denice]

My Bosch 700 Nexxt front loading washer stops draining and gives the message "Drain Clogged" I've opened the front panel and there is nothing to remove, this happens about every 3rd load. I turn the machine off, set it to drain only, it drains and them I must start the whole cycle over again. Obviously the drain is not clogged.
Any solutions?
Denice