Well, I've had this problem for awhile, but it nearly vanished when I started keeping only 1 or 2 tabs open on Chromium, so I figured that was the problem-keeping tons of tabs open. But, I have given up on that idea since it just froze on me while playing Minecraft (not on a server-just Minecraft, and my networking was turned off to save battery).
I initially had this problem, but it was caused by the Intel HD graphics glitch, which was fixed by a kernel update.
So, I am just going to try and tackle it once and for all.
Why does my Lemu4 freeze with 2 tabs open, whereas my desktop, which has equivalent specs (but with an AMD chip and ATI graphics), can juggle 20 tabs and not freeze?