Whilst this only happened spasmodically and it I seemed to track it down to power supply failing on the 120Gb boot SSD.
After several attempts at looking at the problem I tracked down a faulty main MB header connector. I had previously cleaned the pins with contact cleaner but when the problem persisted I tried re-soldering the header pins to the MB. The symptom was the PC Would be working ok then reboot to the BIOS screen. I would check the SATA list an the boot drive would be missing.
However since the last occurance a few days ago (after 3 months of perfect use) the issue started again but this time something is different as every time after a reboot the boot drive is there and the system boots up ok, approximately 5 minutes later the screen freezes followed by BSOD - CRITICAL_PROCESS_DIED.
If I immediately boot to a USB stick and then open a elevated command prompt I find that the boot drive is not there.
If I do a complete shutdown and switch back on and go directly to an ECP (elevated etc) the boot drive (C:) is there but again if I sit and wait at the command prompt after about five minutes the C: drive has gone.
Even trying to run chkdsk fails to finish.
I have tried running SSD life Pro to check the drive and it reports 100% ok with an expected life of 10 years.
However the Windows Event log" shows event 7 - bad blocks.
My system specs are:
Link to Screenshots of some of the checks I made today:
Edited by antonvs, 16 June 2015 - 04:24 AM.