Just an update to everything posted so far. I have repalced PSU and sorted the 3.3 voltage problems CPU has had fresh thermal paste applied to to connection heatsink and fan and heatsink has also been cleaned. Now my CPU has an idle temp of 41 - 44 c I used Super PI to test CPU and it peaked at a temp of 60 C max, and there has been no freezes whatsovere since then. Hopefully this is the problem resolved and I go back on my previous words of "heat not being a problem", as it looks like this was the most likely culprit. Cheers to every for the help and comments. Special thanks for Trixxy for the PSU repalcement. !!!