I have also experienced this problem with the BlackBerry 8830 World Edition from Verizon Wireless.

My first (I am now on number 3) lost data connectivity completely and it could not be restored. I worked with Verizon Wireless technical support - we removed the battery and wiped the handheld with no success. 1X would not appear – only 1x.

My second lost data connectivity intermittently during the day. A power reset would restore connectivity. The problem is unless you’re constantly looking for loss of signal, you don’t realize that you’re not receiving data.

Let’s hope that the third time's the charm…