I've had mine not work before. I've even forgotten it alltogether. The time I forgot it was a real good run in the a main too.

I fixed that problem by buying a personal transponder. The single best purchase I made to make the revo race ready. All the mods in the world don't do you squat if you forget the transponder (or it stops working).

That sucks.

I had issues as well.
First qual it did not even pick me up, second qual it only logged me for 3 laps.
This was tranponder red #5.
So I said something about it and then I ended up with #1.

Apparently these are 3 years old and due to go in for updates and\or warranty work. They have been having lots of issues with the transponders.

I think RCDad was on Red#5. It was either that or Red#8.

I was eager to find out if I came in last or somewhere else. It's difficult to tell.

Anyway, I was real glad the Savage went the entire race, finally got the tuning problem fixed.