Those are common troubleshooting for issues such as not loading correctly. Regardless of what it was maxed out at before the current app should be getting the current levels which are much higher than 300. This is actually an updated FAQ https://care.king.com/en/blog/article/is-your-game-crashing-on-an-ios-device and is typically done for any IOS issue so don't get tied into the word crashing as it fixes many issues
In settings find memory management, then look for apps.. There should be a list of all of your apps, look for friends saga and then when you touch it you should have options to uninstall or clear cache. DO NOT force stop if it asks.
Those are common troubleshooting for issues such as not loading correctly. Regardless of what it was maxed out at before the current app should be getting the current levels which are much higher than 300. This is actually an updated FAQ https://care.king.com/en/blog/article/is-your-game-crashing-on-an-ios-device and is typically done for any IOS issue so don't get tied into the word crashing as it fixes many issues