2011 135 electrical fault issue??

[Burnex]

Hello all, owner of a 2011 E82 135i 6MT

Recently, go to turn the car on, CEL is on.

I continue driving, and the following errors will randomly appear on my nav screen in no order, completely randomly:

Electrical Fault
SOS System Failure
Brake Assist Failure
Passenger Airbag Restraint Failure

They appear in random spurts, and suddenly go away, and I'll have the "All systems OK" prompt.

They each come randomly at different times while driving, and does not appear to affect the ride at all, car is mechanically fine.

Took it to my friend, we put in an OEM BMW battery and had it programmed, still having the issues.

He believes it could be the CAS module, or the footwell module?
does anyone have the slightest clue on where to start??

Thank you!

Edit:/update:

The shop the car is currently at is saying it's my CAS (Car Access System) module?

can anyone shed some light behind this?