Unresponsive

Upon downloading 100 MB & subsequently, another 500 MB completely, the game is smoothly played for all tutorials. The moment the tutorial ends, the app is always unresponsived (the loading icon at the bottom left) when the game returns to the main screen (lobby). It renders the whole game unresponsive to any clicking. Upon exit-&-restart the game, it does respon to clicking for a short period of time (i. e. Go to gacha, draw it successfully, return back to the main screen, & then the game gets unresponsive again).