Car randomly cuts out

[Garypk]

AUDI A3 / S3 / 2018 Sportback Quattro AWD

Current Mileage 18,000

I’m new to the forum, and are looking for any advice on an issue I’m having with my car. 
The car randomly cuts out while driving. And brings up numerous dash cluster messages. I’ll attach pictures to show these. The car will let u start it sometimes, after cutting out. And sometimes will let you carry on your journey faultless. Sometimes it will turn off a few times. Loose power and power steering control. Sometimes the car won’t let u take it out of, Park Mode. Pop up radio randomly goes up and down with out touching a button. Scanned the car myself, and it was giving me the below codes. 

C111204 / Haldex clutch pump defective / I’ve replaced this with a new pump and oil and primed. Just in case this might have been the issue. 
 

I’ve had the, ECU sent off for tests, and came back with no reported faults. 
 

U112100 / Can signal Terminal 15 / No messages / Data Bus Know messages. 

 

U112300 / Data Bus Signal Reception

 

 

Things ive changed

1. Battery & re-coded it with, OBELEVEN

2. All Relays & fuses

3. Haldex clutch pump, oil & re-primed 

4. ECU been checked. 

id appreciate any help or input on resolving this problem. 
 

its been in the, Audi garage for diagnostic, but wouldn’t fault on them. Either on the test drive. They would prefer it to come in to them has a complete no starter. Which it’s not doing. They want £ 144 Per Hour to try different tests to see if they can find the problem. With the answer not being very convincing. Saying they could do 8 x Hrs on the car, and not find out. They say it’s possibly a, CamBus communication problem. 
or wire harness problem. But can’t be completely sure. 
 

Many Thanks, Gary