Mouse and keyboard in game not working

Happened yesterday and today both times team had to play 4v5 as there was absolutely nothing i could do not even communicate with them and explain my problem Yesterday i didnt get leaverbuster as it was first time in ages that i left a game Today i dont think i will get off so lucky As i post this my team is trying to play 4v5 and theres nothing i can do to help them and ill get the same punishment as someone who intentionally left