After installing GPRS, I noticed that Blazer would randomly crash with a Fatal Exception.

Since I have only about 300k free, I deleted several large data files, and the random crashing stopped!

When I checked my Blazer options, my cache was set for 1024k bytes, and I had only 300k free. Now that my free space is larger than the cache size, and the crashing stopped, I can only conclude that this was the cause.

Note - this did not happen when I used the old CSD connection, only GPRS.