network / reception going off many tiles a day

[Guest fire007]

Many times a day network goes off for no reason.

I have to turn it OFF/ON or choose select network.

Another problem appearing at the same time is that when I dial a number, there is that normal dialing tone but immediately after it a new much louder dialing tone appears and I need to hold Treo off of my head as its extremely loud. Then the normal dialing tone and again a second very loud one...

I do see this only when I'm in a roaming network, no matter which one (tried many).