Good Combination. What are you using for anti-virus?
And a persistent irregular, erratic problem wherein the software—not sure what—results in my keyboard not accepting characters . . . or very slowly. Frustrating.
Have you tried another keyboard?
If it isn't the keyboard then most likely that its either the Power Supply is getting weak (5 years) or the motherboard maybe showing it's age. The power supply for your current system may be difficult to find unless you can find a business that builds and repair computers.
I don't know how the internals of your computer so I can't give you a definitive answer.
