Client Freezing Mid game[Crash]

Lately, when I am playing games my client suddenly freezes and I'm unable to click to move, close my client to restart or open my task manager to force close. The client covers my entire screen like it usually does while in a game, but I can't minimize to open other apps, can't even use ctrl+alt+esc or alt+tab. Best I can do is ctrl+alt+del to restart my entire computer. I looked into other discussions to see if other players are having the same issue. Didn't see any that related to this issue. My friend told me to check if there was an update available for my GPU, which is a Nvidia. I updated my driver to see if that was the cause of it but I still continued to have the same problem with my client. I've even gone into the settings to troubleshoot the client for any corrupted files. Didn't fix the issue, so I redownloaded the entire file from the website to see if that could help. Once again, the same issue kept reoccurring. If anyone has any idea or solution to this problem, it would be of great help. It's really difficult enjoying the game or bring my rank up with this preventing me from performing at my best.