Clash Royale was released in 2016 for both Android and iOS users, it seems the game is very stable majority of the time but no and then problems do occur.
A Clash Royale maintenance break is one of the main reasons for the game to go offline, when this happens it is mainly down to fixing a few bugs and improving the game further.
Other problems do occur such as the app crashing upon opening on mobile devices, Supercell servers going down and mid-game freezing. Just like its borrowed setting from Clash of Clans popular games can have difficulties and when you have yours please do list them below.
If you are having issues with Clash Royale please do comment below with what platform you are using along with your problem.