Champion select unknown error

Hello

this problem has been happening to me for a long time now more than a month

when I want to play ranked or normal draft and people ban champs and pick I don't see what they do and the time freezes on 0

and when it's my turn I can't pick or do anything cause I don't even know it's my turn time keeps freezing on 0

please help me I lost many points and today it happened twice and I lose 20