Hey, this is no doubt one of the worst feelings in League. If you're able, can you send in a support ticket with your logs attached. You can just zip up the whole folder I'll make sure they get to the right people.
Issues like this are hard to track down, and logging won't always tell us what happened, but any little piece of information helps.
Best info to provide: * this video * pc specs * log folder zipped * network provider info and if you're wired or wirelessly connected