I have a Siemens 3500 that will drop power (a quick off and on) when everything comes back up they will notice that the phone time will be off. Usually it will be around 30 to 40 minutes slow than the actual time even though the phone system was not off that long. The phone system should be on UPS so it shouldn’t reboot anyway. The software is version 4 anyone know why it would periodically power down and back up?

Does it seem to happen at any particular time of day?

We had a 3550 doing the same thing, but it was always happening around the same time in the AM. Upgraded versions (I cannot remember what it was or what it went to) and it was OK.

Steve

Had one with a bad Power supply do the same thing a few years back.