then you have an ecu and radio problem, or maybe coding them, they would be understood or it will stay that way because of pins and can bus issues, what you can try is to remove it and see the diagrams of the stickers of both radios if the CAN H CAN wiring L coincide in the pin, if they are correct, you can try to match them in vauxhall having the CAR PASS of your car and the donor car, although I think you need to match it first in the donor and then match it in yours, and it would work if everything It's correct, although it sounds to me like they were annoying pretending that they are not married every 20 seconds, but I don't know if they were radio and screen or also with the car's ecu, you can't pin this yourself because the signal is given by the ecu, in the CAR CDR there was a separate cable signal