client crashed says i disconnected

The Client is a cruel and unforgiving thing sometimes. One of the best ways to prevent unwanted client crashes is to make sure enough memory is available when the game starts, usually by closing excess programs or tabs from open windows. Sometimes you can ctrl alt dlt out of enough things when its giving you a hard time to get back in, other times you have to reset your whole computer. It really is a tough thing.

If you're looking into fixing the issue, the best first move is to download and run the Hextech Repair Tool.

Should this not work, Riot Support also has a connections issues Troubleshooting Guide that goes over possible problems and their solutions one by one.

An additional tool you could use is the Lag Report Tool. The What Can I Do? page has a lot of potentially useful advice.

If all else fails, you can always send in a Support Ticket and get help directly from Riot Support.

There had been some reports of client crashing in ARAM games. Riot wants you to send in a dump file to help them identify the problem.

Please contact support; https://support.riotgames.com