Sometimes i can't use summoners and/or my ult

So i have recently started experiencing that at random points in time, i am unable to either use summoners or use my ult. This is very inconvinient as this kinda screws with flash plays or clutch teleport among other things. I have also certified that this is not due to the game not registering input, as i have tried to manualy clicking on said summoner spell and try to force it to work. It lasts for a short period and then is avaible for use again, functioning like normal. At the same time i can move around and use normal abilities. It seems very strange to me, but it is not plesant to experience this shortout in say a teamfight. I hope this can be resolved. I have mostly been playing Darius using the Dunkmaster skin while experiencing this issue.
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