We’re here to troubleshoot connection errors, and that’s what we’re doing. Without getting diagnostic information like Zuvykree requested, we can’t confirm what happened and why you’re having this problem. Keep in mind that while many connection problems are similar, there are dozens of possible problems which can lead to a disconnection.
Until we sort out your technical problem together, you will continue to disconnect, continue to lose ranking, and continue to impact your fellow players games by leaving them without a person for critical team fights.
This isn’t the forum to discuss ranked penalties. If you want to get our help with your connection issue, please do post that WinMTR we requested earlier. We’ll be happy to continue troubleshooting with you.