GRA and Communication Issues between... Motor & Onboard Network Controller

It is a Fabia TDI (MKB ATD) with a retrofitted GRA (correctly and cleanly wired!).
STG.:038-906-019AF
Sometimes, in poor road conditions and wet weather, the cruise control system can disengage unexpectedly. The cruise control system is connected to the central control unit and communicates via CAN with the engine control unit (unlike other vehicles, it is not directly connected to the engine control unit!). When it occurred again recently, I read the error codes:
1 DTC Found:
18097 - Powertrain Data Bus: Implausible Message from Central Electornics 35-10 - - - Intermittent

Does anyone know the exact cause, and can anyone help me decipher the "35-10 - -" in the message?
I have verified the correct function of the GRA switch in the central control unit (09) in measurement block 22, field 2. Everything is OK. No known error logs or malfunctions elsewhere.

Stay positive and thank you
OlBe

[Translating...]

Hallo,

ich habe leider auf die schnelle nur den Schaltplan von VW und Audi für den ATD hier. In den dortigen Schaltplänen ist die GRA noch direkt an Motor-STG angeschlossen. Kannst Du mir mal die Teilenummer Deines GRA-Schalters geben?

[Translating...]

Hallo,

das ganze sieht für mich wie ein Leitungsproblem im Bereich CAN-BuS aus.
Da Du den orginalen Kabelsatz genommen hast, gehe ich mal davon aus, daß die CAN-Bus Leitungen ordentlich verdrillt sind und nicht an extremen Störquellen liegen.
Vielleicht überprüfst Du nochmals die Kontakte der CAN-Bus Leitungen vom Schalter zum Gateway auf sicheren Sitz (nicht nur den gesamten Stecker sondern die einzelnen Kontakte).

Hi Michael,
I didn't do anything on the CAN-bus line during installation.
The switch obtains power via the brake pedal switch (bl/rt Pin 2) and (presumably) transmits it via the ws Pin 10 - wire to the motor-ECU (fail-safe). The individual positions of the GRA lever (SET/-, RES/+, ON, STOP, OFF) are evaluated by the control unit on the control panel and transmitted via the CAN bus to the engine control unit...
Where (on which connector) of the main power distribution box (09) are the CAN bus lines connected? Would like to trace it through the wiring harness...
Does anyone know what "35-10 - - -" means in the error log? Maybe that gives a clue about the location of the Wacker...
Stay positive
Olbe

The problems have stopped (I haven't done anything). A week ago, there was an error entry every 5 minutes. Now, after 6 test drives, there are no more entries. It seems the "Wackler" (likely a playful or teasing term) has probably shaken things up to bother me later...
For your information, the numbers in the error entry mean:
35 means no error type (no further description)
10 means intermittent error
00 means error is permanent
And in the measurement block 125 and 126, you can monitor the communication with the other control devices.
Cheerfully shook head
OlBe