I have flashed OMNI and CM, and I'm getting the same issue with both.
My phone stops working and I have to hold power button to shut down. This happens many times a day with no apparent reason, on the most different scenarios. I want to know if this happens because they're nightly builds, and thus unstable (everyone should have issues) or if I'm doing something wrong.
To flash, this is what I did:
-Installed latest CWM Recovery from ROM Manager (Play Store) with superuser access;
-Download zips (nightly build + gapps) on computer and transfer them to phone;
-Boot into recovery mode;
-Wipe data/factory reset;
-Flash ROM, and then GApps;
I appreciate the help in advance!