We have WP Duet dryer model WED8300SW. It has issue of random shutting off during drying , showing "PF" error code. It doesn't depend on how much load was put in. Can restart after waiting for a while. Both dryer vent and power cord connection look good. Can this issue caused by faulty dryer thermistor?

No that problem is going to be cause by the main control board. The part you need is linked below.

Control Board For Model WED8300SW