Game Semi-Crashing

I've not been able to play league for about 4 months, and I've come back to league this week. I've played around 30 games, and every single game the game has closed in the first few minutes, or during the loading screen. The game doesn't bug splat or anything, it simply minimises and takes about 5 seconds to reopen once you click on the taskbar. It's pretty irritating and it's got me killed a whole bunch of times. I'm not sure if it's a game bug or if it's a problem with my desktop, does anyone have a solution to this/experienced the same thing recent;y? Thanks
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