I would suggest reading the topic “Add MOV to 26VAC input Pins? “. Then try jumpering out the PTC fuse. I know that some of these poly fuses are temperature sensitive and some of them can take days to fully reset. I know, people are going to call “bullSh*t” on the ‘days to reset’ statement. However, this time lag was documented in the poly fuses used in other devices, like the Raspberry Pi.
My theory is that the large “pull-in” current what the changing stations is what is tipping the poly fuse over the limit.