Hey Jon. This is a common problem on the ZTE Warp. Try to remember if you installed an app prior to the crash. Remove that app and see if the issue gets fixed. You can also reset your phone back to factory settings but remember that all your personal information and downloaded applications on your phone will be erased after the reset.
Resetting Your Phone
1. Go to Settings > Privacy.
2. Tap Factory data reset.
3. Tap Reset phone. Tick Erase SD card if you want to erase the memory card.
4. Tap Erase everything.
Another solution is doing a firmware update.
Go to Settings > About Phone > System updates > Update firmware
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You can reset the phone by performing the following steps .1.Power off the phone.2.Press and hold Vol+ key and Power key simultaneously for about 10 seconds until the some option appear on the screen which are reboot system now; apply update from sdcard; wipe data/factory reset; wipe cache partition.3.Use Vol+ key and Vol- key to move the cursor to "wipe cache partition" and press camera key to confirm it.4.After 5 seconds, the cursor will be on "reboot system now" again and press camera key to confirm it. The phone will reboot automatically.This will solve the issue