app's javascript 'stops' when another app gets focus

'myapp' functions normally when it has 'focus', But when you activate another app (for example a brower). the front (index.html) and back (main.js) of myapp stops (so main.js doesn't keep on running in the background). But myapp's webview isn't closed. When you click on myapp, you see a blank page followed by index.html being reloaded and main.js restarting

