
To be fair, I've had my share of flakey TC modules... and some reliable Frontiers. I was just never able to figure out what was going on with that frustrating 1603. I also had a 1602 (from a $16 Alcor, not an Omega or Hamilton) that stopped working after I cleaned the contacts with alcohol. No idea what I did wrong there. I don't know if my limited experience is enough to form any conclusion. It's one or two data points. Your milage may vary.
-abe.