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Diagnosing random CAN bus errors is hard.

It is basically a computer network, that allows devices to throw messages to each other, without knowing if there is a receiver at the other end, and without any kind of 'server' controlling the communications.

https://en.wikipedia.org/wiki/CAN_bus

Things you can try.

1. If you have any non Mitsubishi devices connected to CAN bus i.e. for example if you've fitted and ODB2 dongle to run the watchdog software, remove that device. (Users have reported errors caused by ODB2 dongles previously)
   
2. Check the 12V battery connections, make sure they are seated correctly and tight.
   
3. Make sure that the 12V battery is holding sufficient voltage.
   
4. Check the cables connected to the devices that are reporting errors, make sure they are plugged in correctly.
   
5. Make a general check of the car's wiring, look for damaged cables or loose plugs everywhere.
   
6. Somewhere, there should be terminating resistors on the legs of the network, try to find them and make sure that they are connected.
   (I'm relying on wiki here, I've never tried doing this)
   

It could easily be that there is one device on the network that is failing, and it is causing problems everywhere.

Hopefully, one of the more technical members, who has worked with CAN bus can assist further