I’ve never had it but the only thing I can suggest is fly the CRJ and when it occurs again hit active pause and go through the displays to see if you can see something. fuel, electrical and engine displays are the obvious ones but go through everything you can.
I’m increasingly convinced that the always-on switch bug causes a lot of weird bugs. With the CRJ especially I had to make sure every one of them was unmapped and replaced with a spad.next macro.
The problem is that you may not find a hint in the UI. Eg. in the CRJ i had to enable avionics bus 1 on my alpha yoke for AP to work. The aircraft setup was fine but a ga aircraft config caused the jet problems. This was because it is an always on switch so it was always forcing avionics bus 1 to off even though it looked ok on the jet.
Seriously annoying! And a hard to spot bug generate for years to come if it remains unfixed.