How to disable Xperia Z2 burst mode?

Almost every time I take a picture by camera hardkey, burst mode is activated automatically although I released the key immediately. I don't expect such a short press to activate burst mode. Therefore, a new folder for the burst series is created. Most of those folders have only 1 photo and those photos even have the same name. All of that make photo managing and syncing really frustrated. How can I disable that feature? I don't want to disable burst mode completely.