Error when Tab

I just joined a game and when I pressed tab it showed nothing, it was blank. So I tried disconnecting and reconnecting and then wouldn't let me reconnect, so had to restart the client and then when I got back into the game they'd done a remake (I missed it by 6 seconds). I've lost 20lp because the I was trying to fix tab so I could see the enemy team's items and cs. Has anyone else had this problem?
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