What was the episode that supposedly gave Matt Paxton PTSD?

It may have just been me, but I remember seeing a comment either on this sub or someplace else saying that Matt turned to Dr. Zasio for comfort after a particularly rough episode, and that it supposedly left him so scarred that he took a break from the show for a while.

It was an earlier episode, prior to Seasons 7 and beyond, I believe, but that’s really all I remember.

Comment away! Thx <3