Solid LED and not re-registering

Hi

Does anyone have a difinative answer as to why the M1306B will not re-register to the network and stays locked off for ever until re-powered ???

Any help would be very helpfull

Mark

Is there a suitable network to which it can register?

One client of ours are also seeing this. It stays registered for weeks and then just goes offline. They then have to drive out to the units, re-power them, and then all is well.
(Note: This is on a custom design, but functionality wise it is a Fastrack, Q24PL002 inside)

It is very difficult to find out what causes it since there is no message log - if one could have seen a CREG: 3 or something that would help.

the network is vodafone but also locks on orange