Spoke to Ford dealership. They keep postponing my service, apparently my issue is not important enough.
The guy I spoke to reckons 3.4 is not designed for Mk4 Focus. According to him, a new build of 3.3 was due to be released in April, but it was delayed due to Covid-19. He is confident the new build will be out within the next 2 weeks and it is supposed to fix the sensor sounds, emergency failure, sync problem etc. I hope so. They’ve put me off until early June. If it’s not fixed by then or if they fob me off further, I’m going to push CRC to return the car. But I’d rather not have to go down that route.