If this is a Z97-HD3, which was a solid entry level board for Haswell but is now 7 years old, then it's very likely that is exactly what is happening especially if this system has seen a lot of hard or continuous use such as for gaming, folding or even just very frequent continuous normal usage.
Memory errors reported by Windows are often not actually memory related or at least not specifically the fault of the memory itself. They CAN be, but often they are the fault of poor software memory management, other hardware issues like motherboard or CPU or even a weak power supply.
What are your FULL hardware specifications including EXACT power supply model, how long that power supply has been in service and any other useful information you can offer?
Given the age of the motherboard, replacing the CMOS battery with a new one might be a really good place to start, as it's definitely at the age where that could be an issue.
Power supply: Thermaltake smart SE 630W 87% efficiency
Motherboard: gigabyte gaz97hd3
CPU: intel i5 4690k
GPU: AMD Radeon R7 360
RAM: Kingston Hyperx Fury 3x4gb
Monitor: DELL S2421H
HDD: WD 500gb
SDD: Kingston 256gb
Im unsure how long the power supply has been in service but i could say that it is definitelly not recent,
maybe even similar to the motherboard but a few years for sure.I can add that a few hours ago i turned the pc
on and everything was fine (single startup beep). At this point its really playing games with me.
The biggest problem is really getting a new motherboard if the issue is really in that. My CPU requires
ddr3 which are no longer manufactured and a certain chipset as well as a socket and i can simply not find the kind
of motherboard that would be compatible. Id have to change my CPU as well as all of my RAM, and that really is a big expense.
Id rather try anything else, try to somehow fix it,just so i can hopefully avoid that option.
However i do realize, like you said, that the death of my motherboard due to usage for so long is inevitable.
I could also mention that while i was playing a video game ( at which i reach most temps, cpu 50/60max and gpu 70max), the time I booted it and got no beep is when i got error messages in the game itself saying "steamnetworkingsockets lock held for 5.5ms. (performance warning.) servicethread,postconnectionstateupdatefordiagnosticsui this is usually a symptom of a general performance problem such as thread starvation." not sure what that was about but im sure it just got buggy for a second.
I also did a memtest (mdsched) however, when i click restart now and check , the monitor goes black but the light is flicking, and the pc is still working, the fans are spinning but nothing is happening.
I then pushed the power button and it immediately shut down and restarted itself with a single beep. I repeated the process. The same thing happened, nothing on the screen, but this time on restart there were no beeps.
I hope this helped. Thank you so much for your reply!