Yes, it doesn't seem to be the norm here. Barry and I discussed the issue and Barry thought it might be enhanced because I only have 2 rails! I'm trying to think of ways to solve the issue here. Moving the TMCC base to the farthest point away is just a test. Not sure what brings this on for some users?
I added an upper loop of 3 rail track. The problem popped back up. I traced the issue and found that the TMCC signal got connected thru a common TIU and Z4000 running both 2 rail and the 3 rail loops. I have separated them now using more PH180 bricks for the 2 rail and running the TMCC alone.