Client comeuppance?

Recently I've been having a LOT of trouble with the client. Some of it has self-resolved but new issues keep popping up or old ones come back after some time.

I'm particularly to see if anyone else had had any of these problems:

• Client begins start up, shows logo for League of Legends, but then never actually starts/never gives login screen
• Client randomly kicks you out of queue for no reason, has resulted in low priority queue times on once occasion
• Client only shows match check for a split second before disappearing and saying you missed the check or declined, with the sound continuing to play out for its full duration as if it were still on screen (even though it isn't)
• Random disconnects despite internet connection being 100% up and running and connected to PC
• Creating a lobby, and hitting find match only for it to disband the lobby, with a message coming up saying: "You were unable to create a lobby" only for me to do the same thing again and it work perfectly fine
• Rune pages/masteries not loading unless I reboot client

If anyone could input about these issues and their experience, or even possibly how to fix these issues, it would be greatly appreciated <3