Kenmore front load Not draining and spinning

Kenmore front load some light loads ok. Most loads Cycle, stops, and lights blink before cycle drains and spins. I have to start drain spin cycle to finish load and sometimes it starts to drain and sometimes it locks up and I have to wait a while and start drain cycle again later. It is stacked and sometimes dryer goes to pf message too. I also notice reengaging door sometimes helps.