The usual and hard for some to accept cause I'm running into are HDDs with high values in Smart 01 and 07 registers. You can see those in Crystal and Speccy. If you can, tell me those values.
As to RAM, the usual is to run MEMTEST for as long as you can. Passing is "no errors."
The idle and freezes has been traced to so many causes so we'll have to do better on clues.
For example, how long has it been since you used the canned air and checked the fans? My criteria for fans is pretty high. That is "works like new."
So my Acer Aspire XC-780 has been acting strange for the past few weeks. Firstly, I was just just minding my business and the Blue screen of death occurred. It said Memory exception stored, I can't remember what it said exactly. And yes I did lose my work.
I thought it may have been a hard drive problem so I checked on crystal Disk and it said "Cautious" I checked on other software and every other software said Ok or healthy.
A few more weeks later, problems started rising. I got the blue screen of death again and if I leave my computer idle for too long it freezes. Sometimes the start menu and the task bar won't be clickable at all.
I think this may be a ram problem but I'm not sure. It could be a hard drive problem. How can I check my RAM's health status? Or is it my hard drive?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic