It arrives back tomorrow so I will test it (again) to see if anything has changed. Odd that they have been testing various games / movies out for hours and can't find a fault with it.
After the problems first started with FFXIII, I could barely get 10-30 mins out of any Blu-Ray game I was playing like LBP & Bayonetta.
At least they haven't charged me anything extra. I sent it in to see if they could diagnose the problem and fix it. They could have told me some bullshit about having to install a new laser when it didn't need it but instead they will just return it, no additional cost. =/