Why do I get timed out for no reason?

I can only think of three possible reasons you lose your turn when timed out, one is because you took too long to change gear or such along with setting up a shot or looking around to make a shot in a tough position. The other possible reason is letting the time pass by (do this when the other player is having a bad time). The third is you let yourself get distracted or otherwise busy doing something else while attempting a match and not paying attention to the alerts it is your time and thus you lost out on that turn.