Okay, let's eliminate one possibility at a time... start with heat first.
1. Open the PC casing.
2. Get a stand fan and blow directly towards it.
3. Run the PC for a while and observe.
If this solved your PC problem, then you need a new casing which supports better ventilation.
Otherwise, I suggest you download one of those memory test programs. Personally I have not used any of them, therefore I couldn't recommend any to you.
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