If Bell determined there was a problem then call them for a Technician, there are no indipendents that can offer repairs to these units to the best of my knowledge.
As for being 'shaken to death', I know of HD PVR's that have been in the rear of Technicians Trucks for months, they have covered thousands of km's and still function when plugged in. If the Hard drive is spinning and the machine is moved, yes you can kill it, but unplugged, not so easy.
I am still NOT convinced you have changed the Remote Address, you said you tried to "Change Remotes".
Just call Bell.