I have a whirlpool electric dryer. It stopped blowing hot. I took it apart and checked t-stat, thermal fuse, and heating element. All had continuity. I re-assembled and it was blowing hot again. 3 days later it stopped blowing hot again. Did the same thing tested all again all still showing good, re-assembled and it started blowing hot again. What is broken or what can I test to see why it is doing this?