[Gameplay] Shop Item Undo and Unresponsive Spells

I was playing yesterday (hail satan ;) ) and I died and bought while I was waiting to respawn and then decided I might want to take instead but I couldn't click the undo button. I tried to again after I was alive but still couldn't. By the time I was alive I had enough for and bought that as well. I could return that item but not the items I bought while I was dead.

Also I have been having problems with spells not casting. On Aram I was playing and was trying to use but it wouldn't cast. Stood still behind turrrent and hit D, and only D about 8 or 9 times and it still wouldn't cast. Finally about 30 seconds later it finally cast when I hit it. This has happened at least one other time with ! Spammed it and it never cast, luckily I survived. Other times I notice this is when I play I'll cast Q and W at the same time and then follow it up with E and I'll be lucky if I get 1 of them to cast. Has anyone else been have these problems?