I am definitely experiencing the same problem, i had to restore my iphone and re - jailbreak it. After that i only installed remote messaging from cydia and my phone froze again
I'm still having issues with 3.1.1. I never get to the point when the phone crashes but apps frequently freeze. Disabling RemoteMessages returns things to normal.
Comments
ETA: Since this is an urgent issue; very soon.
Hope to see more stability in 3.1.1