Disappearing ram on EVGA Class3 + [PI] F3-12800CL7T-6GBPI

[conrad.c]

Hi
Sorry for my English but I use online translator
I have a problem, I have a EVGA motherboard CLASS 3 and ram [PI] F3-12800CL7T-6GBPI. The problem is that at some time
disappears me 2 GB of memory. After turning off and turning on the memory
back
I've tried to set the XMP, raised my voltage to 1.6 but it did not help.
Does anyone can help me?
I7 950 processor, the system windows 7 prof. 64bit

[Tradesman]

Try pulling the sticks and clean the connectors, reinstall and ensure they are firmly seated