Recreational Vehicle Lpg Tank Valve/gauge problems of the 2008 Dodge Magnum

This is a police package 2008 Dodge Magnum. We have a fleet of them. All have the same issue. While operating the vehicle the officers experience a system shut down. The systems include but are not limited to all dash warning indicators come on suddenly, the alarm system indicator illuminates and begins to flash every second, gauges go to zero, the transmission down shift to 1st gear, power reduction kicks in, if the officer place the vehicle in park it will not come out of park, it becomes locked. Also the if the officer shuts the vehicle off it will not start and the security system warning light blinks every second. Only after pulling fuse 11 turning the key on and then off reinstalling the fuse will the car start. And maybe go into gear. The last time this has happened 3 weeks ago the officer had a perp in the back seat and the car stalled out on him. He got out of the car to open the hood and his keys were left inside. The locked itself down, and the doors locked automatically. The person in back became trapped for an hour until I was able to by pass the locks with a spare key. The local dealer has charged us an exorbitant amount of money to change several modules, recalibrate, and test for the failure. Nothing has been circumvented to prevent this from happening. Our police department has parked these vehicle due to this safety issue. The question remains, is there something wrong with the can bus system? or will a simple key switch fix the issue? if so why not install a later model key switch that performs correctly?.