Stagea Sporadic Errors

The symptoms you describe, including the sporadic system failures, temporary shutdowns, and stored error codes, are indicative of a potential issue with the vehicle's communication network, specifically the Controller Area Network (CAN) BUS system. It sounds like your Stagea has gremlins, much like a computer network with a loose cable. Before escalating to potentially costly repairs, it would be prudent to meticulously inspect all cable connections associated with the affected control units. Have you already performed this step?

Inspect all cable connections? I'm not really sure where to even start looking! Is there a common culprit area, or a specific control unit I should focus on first? Like, is there a 'main' cable, or is it more like a spiderweb of wires?

Locating the precise point of failure within the CAN BUS system can be challenging. However, given the symptoms you outlined, it would be advisable to begin by examining the cable connections associated with the central control unit, and the audio/navigation systems. These modules often share a common connection point to the BUS. If a visual inspection does not reveal any obvious damage (fraying, corrosion), it might be necessary to consult with a qualified technician who possesses the diagnostic tools and expertise to perform a more in-depth assessment of the BUS system. The scan tool should help the workshop to point the technician to the correct cable connections.

Okay, I appreciate the insight! Sounds like it's over my head. Dropped it at the shop this morning. Turns out it was a dodgy cable connection to the control unit, just like you said! Repair came to 155€. Thanks for the help!