Sometimes I get no data access, randomly.
This happens randomly when I check my phone, the 3G (or 1x) symbol is still there, but when I try to log onto gchat, surf the web, anything data related, it says cannot connect or check your connection. I once left it like this while driving home from work and it never fixed itself... it just stays data off.
I have to turn on airplane mode, then turn off. Or I have to restart the phone (i just restart because airplane mode takes just as long to "turn on").
This will get my data access back.
There was another thread about the droid 2 global with a similar issue on the next page.