My PC crashing should I upgrade my PSU?

May 5, 2018
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This is my computers specs:
CPU: Intel I3-4360
Motherboard: ASRock H81M-HDS
RAM: 8 GB of DDR3
GPU: Nvidia Geforce GTX 770
PSU: CX430 430 Watt
Storage: 1gb HDD,
250gb SSD

But the problem is I have been having my computer fully reboot (with no error messages) quite often mainly during games like Fortnite and PUBG, but now I have started also randomly crashing when I'm just browsing the internet or when I'm just opening any other game.
The temperature is usually on about 45 degrees Celsius while I'm just idle but when I start playing games it goes to around 55-60.
Thanks if anyone can help (also if I made no sense in parts of that sorry because I'm kind of new to the PC scene.) Also if you need more info please ask :)
 


Okay right.
What would you recommend me getting because I have a sort of low budget but I really don't know what I need.
Thanks anyway!
 


Would a EVGA SuperNova G1 650W be a good replacement? I've found one online for $90 USD which seems like a decent price (for my country atleast.)
Thanks again.