Serious EVDO Roaming Issues

[cloudn9ne]

I am having problems roaming on the sprint evdo network while using my alltel 6700. It seems that after about twenty minutes of an open connection the evdo just quits working but still displays that it is connected. The only way to make it work again is to manually disconnect and reconnect. Typically this would not be a big problem but I am using push email and this issue makes it so I may not receive important emails until I reset the connection. I am using prl 40029 and have had this issue with WM5 and WM6. Thanks for any replies.