"He who marches out of step hears another drum." ~ Ken Kesey
our old gauntlet acted strange when air flow was restricted. Do you have any air issues?
If that's the ONLY scenario where the indexer stalls, why would they think it's a bad servo? Doesn't make sense to me. Looks like it indexes fine after the reset and if it NEVER does it unless a stop action, yellow cord, restart sequence is done then it seems like a software/programming issue. Yellow safety cord signal is either connected or not, a poor connection should result in a "no-index".
I would hanker and idea of the battery on the cpu. Turn off, take it out take it down to batteries plus and have them make you one for under $50. Have them check it of course. now on some machines if you do that you lose the program, check the book to see how they tell you to do it.Shane