So for clarity, your phone reboots when you get to work and you never had issues on MMuzzy's ROM? I'm curious which radios you're on (GA02 FH05, etc.). Also, are you using anything on stock that you aren't when rooted (particular keyboard or battery saver, etc.)? MMuzzy's ROM for several people had issues with GPS, I know you said you haven't had issues with it locking but perhaps whatever bit of code is causing the glitch in his ROM for some is saving you. First I'd try turning off your GPS location services and see if it reboots when you get to work. If it does still reboot, it could be a radio issue in which I'd recommend flashing an earlier or later radio (if you're not on GA02 which is the latest I would update to that or if you are on it, flash back to FH05). If you continue to have issues even after trying a new radio, then try disabling LTE and use CDMA only then see if you have issues. If you continue to have issues then it's likely either related to the reboot issues that got addressed with the 4.2.2 update from 4.2.1 that Sprint never did or it's a hardware issue.