Data services disconnects when placing or taking a call

[defx6669]

I just got a sprint touch about a week ago and the first thing i did when i got it was to upgrade the Rom to 3.03.651.4 and get the unlimited data plan from sprint. I haven't have any issues with the phone and I haven't done any reg edits but I seem to have a problem with my data connection. Whenever I receive or place a call I get disconnected from my data services and they usually come back after the call is over. I contacted support and they told me this was normal and that some phones do it and others do not. Is this a normal issue? Or is there something I can do to fix this issue? I tried searching the forums but I only find info on suspending the data connection to save battery life. Any help or suggestions would be appreciated.