Laptop stops charging and then turns off

[Hlmln]

I have a lenovo ideapad 520.I have ran into a serious problem with it lately. So, I have had this issue everytime I open a game and play for a while, and then my computer gives me a continuous clicking sound and laptop says its not plugged in , and after 1 minute the laptop becomes unresponsible and freeze with black screen. I reboot the laptop with power button and it boots as if no error happened to it. The problem can happen in the first 1 minutes of playing or it could go on till the end of the day. I run the game at the lowest settings and yet this still happens. It only started to happen a 1 week ago. Could this be a power supply problem? I am certain this isn't an overheating problem as after my laptop shut down, I tried to check if it was heated, and it was barely even warm.

My Specs:

Processor: Intel Core i7 8550U quad core
RAM: 8 Gb
Windows 10
Ssd : 1tb
Graphics card: nvidia MX150

I am also certain this isnt a virus issue.since I scanned it with malwarebytes anti rootkit and with avast and nothing detected. Please provide a solution or tell me what the problem here is. Thanks.

Also if i unplug the AC adapter as soon as the clicking sound starts the clicking sound goes away and laptop runs fine at battery.

 

[LegendK]

Well the overheating can't be noticed after you shut it down, you must check your temp while running, try some temp check software like OpenHardwareMonitor or MSIafterburner.
About the clicking sound, could you specify where the sound comes from?

 

[Hlmln]

Well the overheating can't be noticed after you shut it down, you must check your temp while running, try some temp check software like OpenHardwareMonitor or MSIafterburner.
About the clicking sound, could you specify where the sound comes from?

It comes from the fan