Newly built gaming pc shutting off and then turning back on

[Will-Vickers]

I am fairly new to pcs and this is the first one i have ever built without any help other than youtube videos i was amazed to see it turn on straight away and began to run windows. I have set it all up and it is working fine other than in rocket league when i hit the ball i get rapid fps dips that are notice able and after a while of gaming my pc shuts itself off waits about about 30 seconds and restarts again. I have no clue what could be causing it however i dont think its overheating as when it reboots i check corsair i CUE to check the temps of the cpu motherboard etc and there all around 50-65 degrees.

 my specs are

 

Operating System
    Windows 10 Pro 64-bit
CPU
    Intel Core i5 @ 2.90GHz    30 °C
    Coffee Lake 14nm Technology
RAM
    16.0GB Dual-Channel Unknown @ 1333MHz (18-18-18-44)
Motherboard
    ASRock B365M Pro4 (CPUSocket)    30 °C
Graphics
    Acer KG241 P (1920x1080@144Hz)
    HDTV (1360x768@60Hz)
    4095MB NVIDIA GeForce RTX 2060 SUPER (MSI)    36 °C
Storage
    931GB Western Digital WDC WD10EZEX-08WN4A0 (SATA )    27 °C
    953GB Patriot P200 1TB (SATA (SSD))    40 °C

 

My power supply is a corsair 550w 80 plus gold certified

 

(Specs are shown from the app speccy)

 

I also have 3000mhz ram and my motherboard can run up to 2666mhz so i dont know why it isnt running at that.

 

Any help would be really aprecaited and if anymore information is needed pop a question and ill try come back with an answer.

Thanks.

[Juular]

No blue screen ? Just straight up restart ?

[Will-Vickers]

yeah black then waits then straight back on