Firstly... if you want to get away from frequent disconnects, do NOT go to Bulldog! Plenty of threads on here about Bulldog's shoddy service...
Also,
and if you want me to have a look at the logs, PM them to me and i'll see what is going on
The CMX's are extremely reliable though, so it is more likely to be a power level/ noise issue than a problem with the modem itself....
either way an engineer would be required and what jimbo said applies ^^^