I have a LG Optimus T that i've had for little over a week and had the same problem with the crashing shortly after launch.
this coincided with my phone giving me messages about how the disk space was very low.
This was dissapointing considering I had the phone for all of 5 or so days,
but I deleted off angry birds and angry birds rio (around 40 mb or so)
and the problem went away
a full wipe IS NOT needed, but disk space seems to be
I am currently working on figuring out how to install apps on the SD card to limit my normal disk space use