Ranked champion selection freezes

When I am in champion selection for a ranked match, the timer counts down till 0 and stays there. I can still change my masteries and summoner spells. After a few min I get a report, I need to wait 30 min (because I left the selection) and lost 12 LP. I started with 80LP in bronze 2 and now I am -1LP in bronze 2. Its going on for a few days now and league of legends support doesn't help me, anybody know what I can do? Normal games are just fine its only in ranked champ selection. Sorry for my bad english BTW
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