[CLIENT] League client disappearing

During my last three games I had an issue where while playing my client screen turned black for a second and then disappeared showing me my desktop. When I alt-tabbed to get back in to the game I noticed that instead of just switching to another app or the desktop my client was still selected. I couldn't say there was one thing I was doing when this happened, it seemed to come on randomly.

The first 2 times this happened I was able to switch back into my client and resume play, by some miracle I didn't end up dying either time despite being in the middle of a turret dive the second time

The third time this happened was during a bot game, except this time when I tried to switch back, the client would show up for a second and then disappear again. I had to force quit it and then reconnect at which point the rest of the game proceeded smoothly.

I know these kinds of problems are hard to fix but just wanted to get it on Riot's radar, it's very frustrating