Furnace driving me insane…

Got a 2022 AMANA 80% 60kbtu in a crawler. Installed this for a friend under my old company and he still calls me, I feel obligated to help since I lead the install. This happened after the first couple of months. Board won’t start up all the way, restarts constantly until 120v power is reset. Tech support had me replace the board and I agreed that was probably it. System worked fine for a year and starts doing this again. Checked hi voltage coming in and everything checks out. Made a few repairs but this ones turning me into a parts swapper and I don’t like it…. Any thoughts/ advice as to what the heck is causing this?