GFCI outlet keeps tripping
Computers use a switching power supply so it is possible the GFCI has grown weak or sensitive with age and now sees the computer as a ground fault problem.

It is also possible the computer power supply is failing and is causing the tripping.

Try running everything but the computer on the circuit for a while and see what happens. If it trips again try replacing the receptacle with a new GFCI.

Good luck!