RAM issues

[GoD_OF_GaMiNg]

i booted up a PC a week ago and saw an error that DIMM 3 contained a memory error before the OS booted when i pressed F1 to continue and opened task manager i saw i was runing at 6GB which means i only have one pair in dual channel(i have 4 sticks of 2GB DDR3) and the games i played werent runing well

i tried rebooting with the same issue next day when i boot up the BIOS tells me that my memory size is different and when i log in it says that i am back to 8GB so i think nothing of it and start playing but my game(Assasins Creed Syndicate) freezes and my whole PC freezes i have to force reboot(i pulled the plug) this would happen again and again whenever my PC told me i was at 8GB and i think the RAM in DIMM 3 is the one causing the problem i have tried switching its slots and cleaning the RAM(using an eraser on the gold contacts) but the same happens i posted this to rule out any software issue that might be causing this???

PLS HELP!!!!!!!

 

[DemiGod]

Well for me seems like standart ram issue if you switched slots cleaned the pins and identified which ram is causing the issue the only option I see is buying a new stick