Your comments

No problem.  Love the program!  Thanks for all your hard work!

Reverted to 5.4 and the issue appears to have stopped.

I think I see what's happening.  I have seconds enabled on the taskbar clock, and I can see the seconds portion disappearing and reappearing  every 2-25 seconds.  The main process or service for 7TT is wigging out hard for some reason...