I will let you know If I find a solution. Its not the harddrive as I have replaced this. I have also re-installed the firmware and maps many times, and tried all the different resets.
I am considering replacing the thermal paste between the CPU and heatsink as it feels like a possible overheating, although I have heard of others trying this and it not making much difference.
There is also the slim possibility that it could be the car battery needing a change, although all other electronics in the car work fine, and the car starts first time every time.
BTW the final software update was in 2016 so I suspect you have it already.
I am considering replacing the thermal paste between the CPU and heatsink as it feels like a possible overheating, although I have heard of others trying this and it not making much difference.
There is also the slim possibility that it could be the car battery needing a change, although all other electronics in the car work fine, and the car starts first time every time.
BTW the final software update was in 2016 so I suspect you have it already.