I've been following Hashcode's work on the CM9 ROM for the droid 4, and have kept my phone up-to-date with the latest builds. Unfortunately, I've been having issues with the 4G data on these roms.
Immediately after a full data / cache wipe and a ROM upgrade, 4G connects and functions immediately.
After a signal loss the phone fails to re-connect to any network.
After a reboot, the phone cannot connect to the LTE network, but sometimes CDMA only will still work (3G)
switching the preferred network type in the system settings does not alleviate the issue.
This problem makes these ROMs unusable on my phone. I've spoke with Hashcode briefly over twitter and he indicated that all those two ROMs (Gummy and CM9) both use the same data on boot package. The stock ROM that came with the phone has no data connectivity issues, so I'm fairly sure it's not the phone itself that's causing data do fail.
Looking for help with this issue, or to provide more & better information to anyone who might know what's going on.