Hi Des,
I think I had exactly the same problem, did your unit just start flashing as though it had not been paired after working perfectly?
I went through the reset procedure multiple times with no resolution. They appear to get stuck in some limbo state which will not allow you to re-pair them and they will not respond to any commands from the system (including 4 Zone Wall Remote) that they had been paired with.
I have ended up returning the unit to Amazon, but I've got another one started to exhibit the same issue this evening.
Cheers
Glenn
Desmond Wyard
3 people have this problem