Electrical Issue?

[Steel Panther]

What's causing me to keep blowing my breaker? (I've had this setup for 2-3 years without issue -- until 2 days ago)

Outlet #1: TV/Cable Box/Sound Bar/PS4/Blu Ray/HTPC/Air Conditioner) (no more than 2-3 are on at once)

Outlet #2: Laptop

Outlet #3: Phone/Tablet Charger

Outlet #4: PC/2 USB HDs/Printer/Speakers/Monitor/Router/VoiP/Phone/Modem)

Obviously the only Super Power user is the Air Conditioner...

With ONLY the TV/Cable/Sound Bar and PC on (printer is off) w/ Air... every 20 minutes or so, the breaker switch blows. but doesn't do it right away. Unplugged (not just turned off) the HTPC, and BluRay and Laptop ... Still does it.

The PC however, occasionally freezes up after its in sleep mode or shuts itself off in the middle of the night, not when in use..

I've bought a new Power Supply for the PC, but looking for a 3rd opinion on it, as I've asked a PC guy and he's pretty sure the Power Supply is going.

If it's a wiring thing, I gotta get the maintenance guys up here to fix that ASAP.