525,
Sorry to hear you are having problems. I have never heard of that or seen it in any of the systems I have worked with. I will say that I was having problems with a fax/voice auto switch a few weeks ago. I tried another and it seemed to work better. Long story short, ended up being a telco provider issue. Took several calls to get it corrected.
Does your problem happen on all your lines or only the main one. If you have an open CO port you could try switching to that and see if it helps. If the problem only seems to happen on say the main line you could try swapping lines 1 & 2 to see if the problem follows. Sorry I can not be of more help right now, but I will keep thinking of it.
Steph

PS, could you fill out your profile incase someone wants to e-mail you. Thanks again

Steph

Do the job right the first time.