Abilities wont work

Sometimes i dc from a game for 30 secs - 2 mins due my bad internet provider.

When i get back i am unable to use some of my abilities, might be my q, my r and sometimes outright anything at all. Closing the client and reloging "fixes" it 100% of times, although sometimes i do have to remap my abilities to another key, use them, then remapping as normal. Not sure if it happens only with sion.