A Warm Welcome to the King Community, where you can seek Answers / Suggestions in any King Games' Sections
I am very sorry to hear that you lost the level because your screen froze I will add few Troubleshooting links which usually helps with these kind of issues...
** If the above tips did not help with your issue, please post back by tapping on "Type your Comment" box located below OR by tagging me with @ and my name, just like how I wrote your name above