If you are noticing your iPad starting to run very slowly and Inzant starting to crash then your iPad may have all its resources being used by other applications running in the background. We'd recommend periodically closing all apps running in the background down so ensure the device has plenty of resources to run Inzant Sales. This will also help improve the battery life and reduce consumption of mobile data.
That should be all thats required. If after shutting down apps running in the background you notice the iPad is still experiencing issues you may want to consider rebooting the iPad, see another guide on this
here.