Mxt Problem... Maybe?

[GB_Amateur]

While you're at it, Elkawok, check how well the two connectors are mating.  On my White's SPP/TDI I had a problem just this week when the male connector (mounted to the control box) failed.  The inner part (plastic that holds the pins) pushed completely into the detector.  The female connector (cable end for the coil side) screwed onto the male connector just fine but the pins weren't in contact.  Initially they did contact slightly and the detector worked, but then lost contact and even though it sounded like it was working -- had a normal threshold tone -- it wouldn't respond to the barbecue grill.  That was my first clue.

[Eklawok]

I'll have to check that when I get home. Sounds like simular symptoms, but I got a sneaking suspicion that it is something else. Still worth the check though. What you described is what was happening with mine. Looked and sounded all good, but wouldn't pick up my shovel or the playground equipment until i shut it down and restarted it.