I don't think it's just the
^c because I do that all the time without any problem.
Tonight I had a similar-but-different issue: running
t2 run after coming back from work, this time the program loaded and started running on Node, but the relays didn't work. The on-board LEDs worked though. Again a reboot and things worked as before.
I am still keeping an eye on this until I can find some more reproducible pattern. I will post code when I have a chance.