I have had the same problem with my sprint 8830.
While browsing I lose data signal and have to go to manage network connections and disable/enable them. I get the same yellow -
Tech support had me go to options>network and "start provisioning" in the menu to reprovision the phone. Then I had to go to options>advanced>host routing table and selected "register now" in the menu.
That seems to have helped but I just did it a couple of days ago. We shall see.
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