Glad your problem is fixed, this sort of thing drives me nuts. I had exactly the same problem a while back, broadband would drop out when you used the phone, then started dropping out for no reason. Dunno how many times I rang the phone company and eventually they agreed to come out to take a look. Something made me take the cover off the wall socket before they came out just to check those wires were OK, and turned out a critter had manged to sneak up into the tiny little junction box and barbeque itself across the contacts. Removed the cremated remains, replaced the box and was all OK again
