RAM Errors

[Arvydas]

I have a strange situation, or maybe not.. I have been working as an IT engineer for more than 20 years, we constantly test computers at work.
I upgraded my computer. New processor, additional RAM. I had 32, I bought another 32 = 64 Gb Also a new VGA board.

Yesterday the computer started to simply freeze without load, threw a blue screen (2 times). I checked the RAM - errors. I took out all the RAM sticks and checked them one by one - no errors. I put them all back - no errors. The system trust is gone, and I wonder what is wrong somewhere, because I can't find anything wrong with various programs. Added errors photos + ram boxes
My build:

PC Build:
MB: Z690 AORUS PRO (rev. 1.x) latest bios (29)

CPU : i5-14600K Intel Intel® Core™ i5-14600K BX8071514600K, 3.5GHz, LGA 1700, 24MB (New CPU)
OLD CPU Intel® Core™ i5-12600K, 10 Cores (6 Performance-cores)
2.8-4.9GHz LGA1700

RAM: 64 GB
KINGSTON 16GB 2x) 5200MHz DDR5 CL40 DIMM FURY Beast (old RAM)
KINGSTON 16GB (2x) 5200MHz DDR5 CL40 DIMM FURY Beast Black (New RAM)

XMP : on (5200)

PSU : 850W (be quiet)
GPU: TUF-RTX5070TI-O16G-GAMING

[Richard (PassMark)]

Sometimes, memory errors only manifest themselves when RAM timings are set too aggressively. Try testing with XMP RAM off.
https://www.memtest86.com/troubleshooting.htm#fix

Re-seating the RAM can also clean up the gold contact fingers. Maybe that's want happened.