Holding Q causes crash in game [CRASH]

First, a little background information... Been disconnecting for a while now randomly in-game, and when I do I can't rejoin. I had no idea what was wrong, and I tried a lot of things. I tried turning off my firewall completely, following guides that said rename/delete files and all that jazz (of course, repairing my league client after each attempt). Not only that, but after I disconnect I can't rejoin that SPECIFIC game. If I go on another account and start a new game, it works just fine. I've tried restarting my computer and internet modem, nothing. Still can't rejoin.

Up until now, I've just been dealing with it. Feeling like a jerk that DC's all the time, since, no matter what I try, I can't rejoin the game anyway. I was just accepting the massive waits of the lower priority que since, when I DON'T dc, the game is actually really fun win or loss. It wasn't until a creative game that I realized what the issue was...

Was playing sion, and I discovered that I would often DC during the casting animation of my Q. Using smart cast, I'd have to hold the Q button until I wanted the stun to go off. Lo and behold, when I let go of my Q, it continues charging until the 'Reconnecting' Bar comes up. Only, I never reconnect. No biggy, it's just a custom. I'll make a new one. I choose Sion, use a Q, and once again I DC during the charging time...

At this point I was suspicious. It was so consistent, when usually these DC's were incredibly random and unpredictable. It didn't happen when I pressed Q, only when I held it down for a second or more. I asked a friend to help me test it at this point. I remapped my entire keyboard so as not to use the Q button, and see how that went (WERT instead of QWER for the four core abilities, etc). I didn't DC that entire game UNTIL I pressed Q out of muscle memory, and what a surprise, I was instantly disconnected when I did.

I use a logitech keyboard, it's shitty and wireless and includes a mouse. I've tried all of the logitech fixes, nothing. I can reproduce this crash with 100% consistency now, and of course it happens much more frequently and often as champions like varus and sion. Now that I know the cause of the problem, I'm hoping that someone will be able to help me. Mostly because my DC's have not only been ruining the games of too many people to count, but the amount of time I've wasted trying for 15 minutes to reconnect only to be greeted by 'You've been placed in lower priority for AFK, the game has already ended' to then wait 20 minutes to play another game. One that has a 50% chance of ending abruptly. I'm not looking for pity, I understand that it's a fair punishment and that if I know I'm most likely going to DC, I should simply not play. I am, however, looking for a solution.

If someone could give me an official method of solving this glitch, or if someone COULD do so with more information, please reply. So many strangers including myself have suffered from this, and all I want to do is enjoy the game.

I've been dealing with this silently for a long time, so long rant over. If you need more information about my specs just ask. Thank you again for reading and for your help.