Hi Sapna,
This is a common issue, usually due to the Bluetooth being set up incorrectly. Please kill the app completely and then turn the X1 off and then on to fix it. If that doesn't work, delete the app completely and reinstall it since the app and pump are stuck.
Please make sure you are following the instructions outlined in our set up video: https://www.youtube.com/watch?v=Lhz7m2O9I4s