So, about three of four days ago my computer started restarting by itself without a BSOD, sometimes even restarting every 30 minutes. Weird thing is it doesn't only happen when gaming, it also happens while browsing, watching a (Linus) video or even at idel. What makes me believe it's the PSU is that sometimes it takes the PC 30 seconds to 1 minute to restart (power button doesn't even work).
I passed my antivirus and nothing, temperatures are always OK (CPU Idel a little high at 40ºC but never going over 60 while gaming), I updated the BIOS and all the drivers are up to date. (I upgraded to Windows 10 Pro with the free upgrade but the problem started happening about a month after the upgrade took place). The Windows Event Log doesn't tell anything besides the 'Kernel-Power error 41' ("The system has rebooted without cleanly shutting down first").
My system spec:
Processor: Intel Core i5 4670k @ stock
Cooler: Cooles Master 212 Evo
Mother Board: Asus Gryphon Z87
RAM: 8Gb (2x4Gb) GSkill Sniper @ 1866Mhz
GPU: Sapphire R9 270x Dual-X
SSD: 250Gb Samsung 840 Evo
HDD 1: 2 Tb Seagate Barracuda
HDD 2: 1 Tb Seagate Barracuda
PSU: Corsair CX600
I know the CX series from Corsair is not good but when I bought my components (1.5 years ago) we couldn't get affordable Seasonic units in Spain. The thing is I didn't expect it to dye withing 2 years of the purchase. Is my PSU dying or is it any other thing.
Thanks to anyone who can help. EDIT: GPU added.
EDIT2: Cooler added.