Disconnection Penalty Explanation
Unfortunately all disconnections and game crashes counts as leaving the match and will be penalized appropriately. The game server has no way to discern a legitimate disconnection or game crash from one that is forcefully caused by a dishonest player to bypass leaver penalties. You can learn about this policy here:
If this is happening frequently and you need help troubleshooting your specific technical issue, advice is available but I am going to need a little more detail to the nature of the crash.