Car Owners Hub UK - Built by Drivers, for Drivers

When I start driving for around 5 minutes, I keep getting messages on iDrive like "parking break only partially available," "drivetrain fault" and "transmission fault," in that order. Plus, auto hold is just useless. But if I step out of the car for about fifteen minutes, the messages vanish and then they reappear after I drive again.
After inspecting the earthing wires and all of the fueses, it appears that everything is in order.
Has anyone else encountered a situation similar to this?
Kindly inform me

I am not familiar with any error codes.
Since not everyone checks here to say hello, you might as well post in the appropriate area.

Since I am still learning the ropes, I am confused about which area to use. Would you be so kind as to advise me instead?

The parking brake won't engage sometimes if the pads are very worn. This happened to me.
when it was revealed that every single problem
It was my rear brake pads, I discovered.
I was the only one affected by that.

Yeah, worn pads are usually the root of the problem.