problem when an app is running 24hrs a day

I have created an app for a client that runs 24 hrs a day from an ipad in the registration booth. The app does not require a login. Users just type in their last name and the app takes the name and add it to the database. What I have seen is once in a while (usually 2-3 times a day) the app stops writing into the database unless I close the browser and open it again. How do I go around fixing this problem, since everytime it happens, an employee has to go unlock the ipad, close the browser and reopen the page.

Thanks,
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