Several BSODs In One Day With Same Error - Memory Test Shows No Errors With RAM

Four BSOD today, all with the same error. I can't think of anything that would have caused this. Memory test shows no errors with the RAM. Blue screen's have occurred both shortly after startup without any stress on the system, as well as after it hadn't been shut down for a while with lots open. I can't find anything that forces it to blue screen, seems fairly random (it's happened while I'm not even using the system). Dumps at the very bottom.

Much longer summary: I've got an Asus S400C on windows 8.1 that's about 6 months old. It's been really good to me but recently has seemed a little unstable,(or maybe that's me just thinking badly about it now! I would have said it occasionally hangs more than I think it should for a newish laptop) - but nothing I couldn't put up with. This morning it gave a BSOD with KERNEL_DATA_INPAGE_ERROR. In fairness it had been a while since it had been properly shutdown (i tend to just put it into standby by closing the lid) and I also had quite a lot of things open. I still wouldn't expect it to bluescreen like that though.

I think I've had the same blue screen once before, about 3 weeks ago. Today it blue screened four times in total - the three other times without me asking much of the laptop at all (only word, chrome and itunes open). Definitely not right!

I've run the memory test and it found no errors. Yesterday I replaced a qualcomm wifi driver with a microsoft one (both ones that were already on the system) but reverting back hasn't stopped the blue screens so I don't think it was related to that (it also was fine yesterday evening after changing). I've also uninstalled Asus Liveupdate because it's always saying it's "stopped working..."

It might be unrelated but 2 weeks ago I opened the lid of the laptop to find that I could move the cursor but had an otherwise blank screen (on, but displaying black except for a cursor. Normal resolution though!). I coudn't get it to do anything so held the power button, and when it turned back on it said it was doing automatic recovery, and checking the harddisk - it took about 3 hours to do. Afterwards it booted up and worked.

I've tried to investigate the dmp files with my basic ability to google and something that crops up is win8_driver_error. Also it usually says "Probably caused by : ntkrnlmp.exe".

All previous minidumps and first crash today - [URL] ....

The second minidump of today- [URL] ....

Third minidump - [URL] ....

Fourth minidump - [URL] ....

Left the computer on for a while and came back to it having restarted itself following a BSOD.

BSOD #4 today - [URL] .....