> I have Firmware version: 020810000000 / 041.00 and EEPROM version:
> 103. Now my phone is almost useless.
> Seems like the phone will fail to register after some time, resulting
> no calls can be put out nor calls can be received.

So this happened after a firmware-upgrade? I have read about incidents with
S450IP-firmware-upgrades on a German forum, although their problems don't
seem entirely the same...

If you haven't tried it yet: a cold start seemed to help in the German
cases: unplug the power supply & plug it back in while pushing & holding the
registration-button on the base station for 5 seconds or so... You'll lose
the settings of the phone of course, but hey... if it helps...

Christian