present() not sending or being received?

[Stuart Middleton]

I've been running a small test setup for some time with just 1 node and 1 gateway. For some reason, in the past week or so, I've noticed that the "present" doesn't either send or get to the gateway. I'm using MYSController to look at the messages but if I delete the node and let it re-register itself, it only gets its name and sometimes 1 of the 4 sensors presented. It once got 2 of them. I don't think it's a transmission problem as the node can happily send hundreds of quick fire messages without dropout.

Has anyone encountered this? Can anyone think of a reason this would happen before I start debugging the code?

Thanks,