T430s graphic card (GPU) crashes randomly

Question

Dear Lenovo,
I have bought my T430s a couple of month ago.
I have a undeterministic problem with the GPU. The computer freezes randomly (mostly during video or streaming, but sometimes only while browsing WWW) once a couple of days with the following result:
http://www.youtube.com/watch?v=rtrKaLGHh1M
http://www.youtube.com/watch?v=D7yIJttOZgo
It goes on for a couple of minutes and then the computer reboots.
I went to the Lenovo service, but they had no idea what was the reason as they couldn't easily reproduce the problem. As the computer is my tool for work, I couldn't leave it there for 2 weeks. I gave up trying to fix the problem and accepted it.
Now in my company they ordered 8 T430 and 5 out of these 8 experience the same issue as mine. I believe it must be a standard problem and solution should be known. Is there a one?
Kind regards!

Answer 1

I have had exactly the same problem with my T430, I have had the motherboard replaced twice now and it has started to happen again! The strange thing is after mobo replacement it works perfectly for months and then out of the blue it will happen, it will then happen very rarely (under once a week) but then it will become more and more frequent.
I have checked the RAM using the Lenovo diag utility at POST and using Memtest and it shows fine. I have used the Lenovo update utility to update everything and still it happens.
Have you altered any of your hardware? I am using a Samsung 840 SSD and Corsair Vengence 2x4GB memory (details below).
RAM:
Corsair CMSX8GX3M2A1600C9 NB Vengeance Performance 8GB 1600MHz CL9 DDR3
The problem is the issue is so intermittant that I cannot test it thoroughly without replacing hardware and using for a few weeks or more. When the screen crashes I am not doing anything that is labouring the machine, I usually just have the internet open and notepad as I mainly use it to administer networks, not for streaming etc. and it is on a desk so there is sufficient airflow.