I'm investigating the causes for my 2-year-old Samsung laptop running slow and sometimes hanging under very slow stress. I have some friends which had the exact same model as mine and had to send their laptops back to Samsung, all with similar problems - and each received a different diagnosis. Unfortunately, this is not a possibility for me, since it's not under warranty anymore.
I had my laptop dual-booting with Ubuntu 12.04 and Windows 7, and I was experiencing the problem with both OSes. Tired of Ubuntu, I decided to give Fedora 19 a try - but even with a fresh install I'm still sometimes very slow performance. However, given enough reboots, eventually it runs smoothly.
For all that, my suspicion is that there's a hardware problem. What are the most likely candidates to be causing the problems and which tools can be used to investigate them?