Mercedes GLA audio and nav issues MOST bus fault

I must admit that I have observed a somewhat similar predicament within my Mercedes GLA, though I cannot definitively recall the exact model year. The audio system exhibited complete dysfunction, an issue that subsequently led me to investigate the intricacies of the automotive protocol governing the bus system network. It is my understanding that the disruption of data transmission within the bus network can indeed manifest in the manner you described. Have you by any chance considered a diagnostic assessment to pinpoint the potentially defective control unit?

Diagnostic assessment? You mean like, with a scanner? What kind of thing am I looking for? Is there a specific control unit that usually causes this on the MOST bus?

Affirmative, a scanner tool is indeed what I was alluding to. Regrettably, I lack the precise technical acumen to ascertain the specific control unit that might be the source of the malfunction within the MOST bus system of your vehicle. It would be prudent to seek counsel from a qualified technician at a reputable workshop. They possess the requisite expertise to diagnose and rectify such intricate automotive issues, potentially involving the data transmission integrity of the bus network. It is possible that the bus system requires professional attention. This will likely involve a cost of about 1000€.

I appreciate it. Took it to a workshop, and, yeah, a control unit on the MOST bus was kaput. Replaced it and all is good. Cost me about 1000€ like you said.