Unresponsiveness of buttons

Hi,

Sencha Touch - 2.1

Devices - IPad, Android Tabs

We are facing an issue of buttons being unresponsive. Out of every 10 taps 5 times the buttons don't go to tap event. We have to tap 4-5 times continuously to get it to respond to the tap event. Can you help with what could be the possible reason for this abrupt behaviour.

Regards,

Neha Kaushik