Ok i'll point it out plain and simple.
Put in a chip for a friend, his box is a 1.2 or something around there and just put in a duo x2. Its been working fine for months but now it has started fragging randomly. He brought it back to me and i didn't really know what to do. I tried a different chip but same problem, so i moved onto the solder joints. They all looked good but i redid them anyway. It worked after a few tests then he took it home. An hour later, he was back.
I found some finer solder and redid the points again and it worked for about 50 tests. He took it home and a day latyer, it was fragging again. I have no idea what to do as i have these solder connections looking very neat. Apparently his brother tried it in a different room and then it worked, but it just seems to be random.
What the hell could it be other than solder joints, cos they're all fine! Thanks heaps, any help would be great!