I have had drops a few times an each time I have managed to get it working again by rebooting, airplane mode, toggle 3g, toggle cdma setting, etc. It seems to be happening less and less often but I still cannot come up with a consistent way to correct it. Come on Virgin Mobile!! Please fix it or issue a patch to fix it!
You can follow my progress (and pain) in this category: https://montykamath.wordpress.com/category/optimusvsucks/