my sons gaming computer was doing something similar. he tried and tried to figure it out, but never could. anyway, a month or so he wanted to increase the amount of ram he was running because of a new games requirements. his mo.bo is capable of running 4 sticks, and he had been running 8gb (2-4gb sticks). we ordered him a new 8gb stick which should have doubled his memory. but when he made the change, the computer started acting funny right off the bat. we thought maybe he had gotten a bad stick, or that running 3 sticks was causing the issue. so he took it back out, but the computer still was wonkey. so he took out both of the old sticks and reinstalled the new one, and the computer worked like new. he added back in one stick, and the problem returned. so he swapped it out with the other old stick, and the computer works fine. so it now has 12gb of ram, a 4gb stick and an 8 gb stick. so he had a stick go bad while he was gaming at some point, and he did not even know it. so that is an avenue to check. ask one of your friends or family member to borrow a stick or two, and see if that cures your troubles. if it does not, you can scratch that off your list, and try something else. having a good friend with a similar system is pretty handy if he or she is willing to lend you parts for diagnosis. just make sure to clearly mark who's parts are who's, and if possible, have them be there as you do the testing. that way there is no mixing up of parts. and you get to keep a friend. the big problem with doing that however, is if you break, or your system harms his/her parts, you have to replace those as well as your own.
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