Hello Drixil,
Are these freezes something that only happen in your project or does it happen even when working a blank project? Does it continue to happen in a fresh map inside of your project? After one of the freezes, try checking the output log to see if any errors are being output there. It could be the same symptom of another user I saw recently where there was an infinite loop in one of his blueprints, resulting in freezes whenever he did most actions.