Irql_not_less_or_equal BSOD

I have been having this problem for about 5 days now, my PC will randomly give me a BSOD with the error message IRQL_NOT_LESS_OR_EQUAL. I've gotten in touch with Microsoft who were useless to say the least and now just wish to charge me. I have run memtest86 with no errors and have individually tested both my RAM sticks. All my drivers are up to date and I'm just as to what to do now. It hinders me doing anything that isn't simply browsing the web on my PC and has become a real issue.

Ztruker said:

Nothing useful in the latest dump. Haven't checked others yet.

I did notice your BIOS is fairly old:

Code:

BIOS Version                  0701
  BIOS Starting Address Segment f000
  BIOS Release Date             08/18/2015
  BIOS ROM Size                 1000000

Version 1904 is available from the ASUSTEK web site:

Code:

Version 1904
Description: Z170 PRO GAMING BIOS 1904
Improve system stability          
File Size: 6.77 MBytesupdate 
Date:  2016/07/22

Please update the BIOS and see if that resolves the problem.

Edit: Looked at some of the other dumps and they are all pretty much the same:

BugCheck A, {251b8, d, 1, fffff803232a9b3a}
Probably caused by : ntkrnlmp.exe ( nt!KeClockInterruptNotify+12a )

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Yesterday it worked fine all day without any crashes, however got up this morning and had it start crashing again. Will take your advice and see what happens. Thanks.