treo 600 loses network connection

[1989grog]

My Treo loses its connection to the network all the time.

It doesn't matter if the battery is high or low. It doesn't matter if the network signal bars are high or low. It doesn't matter what time of day it is. It happens all the time, even immediately after hard resetting the device.

My network connection drops while I'm on a call quite frequently. Sometimes I can't place calls because it will have lost the network. Sometimes people try to call and it doesn't ring on my end. Sometimes people call and it does ring, but I can't answer the phone - the display will just hang or it will beep to say it has lost the network connection.

Many times while I'm browsing the web on the device, I have to reconnect and reconnect because it has dropped my connection to the web.

Everything works fine, however, if it is plugged in.

Occaissionally it seems to work better if I rap on it lightly.

What can I do?