Moe, not sure which Bell rom you mean as stock but the one on the UTC starcomm website had a radio update included over what came stock on my Bell touch so if you're lucky it might do the trick.
http://www.utstar.com/pcd/phone_down...ell%20Mobility
I'm assuming you have a Bell touch. This updated locked my phone so I had to run the unlocker again before I could flash it to radio update 2.13.00 which I got from the folks over at xda developers. Haven't had that radio too long but it seems to have improved an issue I was having where the phone locked up if I recieved a text message while I was using the data connection.
http://forum.xda-developers.com/showthread.php?t=358997
I guess its a shot in the dark but I figured I'd mention it.