Game consistently crashing

I have a problem with the game crashing, which is happening most games. The game is operating as normal and then I hear a pop-up noise, like I am getting a notification from another application on my computer. I think the first few times it was anti-malware bytes as when I alt-tab I could see that software was open. Then the games freezes/crashes. I can't alt tab to anything else. I'm stuck looking at a frozen game but can still communicate with friends if I am playing with them. The only way out it to re-start my PC. Has anyone seen this problem before? or can think of any possible solutions.
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