[CLIENT] AFK Check Autokicks me From Matching Queue

The bug is that, roughly 1/3 of the time, the AFK check simply doesn't appear. I hear the sound effect for its appearance at the same time as the message pops up telling me that I've been kicked from the queue for not taking the AFK check. Unfortunately I don't know what's really causing it, only that it seems to happen more frequently (maybe 2/3 of the time) if I alt+tab out of the league client to do other things while I wait. Because of the increased chance of autokick, I've since stopped alt+tabbing, but it doesn't entirely fix the issue. I'm running League version 6.10.16_05_13_13_53 (or at least that's the number at the top of my client, so I assume it's the version), and this does seem to be a new-ish thing for me, since I hadn't played for a few weeks and don't remember it from before I came back to League a few days ago. My computer runs Windows 10 Home version with a 64 bit operating system.