To me, it sounds like an actual RAM issue, best bet, pull it out, and reseat it. If that doesn't fix it, you have a couple options: deal with it (reboot when it happens, cold boot is preferable), buy new RAM (costly), or disable blocks of RAM via CMOS/BIOS (if the BIOS supports it).
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I have this problem at times also. Usually a reboot fixes it until it happens again.
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The reason a reboot fixes this problem, is because RAM is volitile memory. You reboot, and it flushes it. I suggest cold boot, and keep the system shut down for 2 to 3 minutes to ensure that all RAM segments are cleared.