Is it the TWA shutting down or is it the apps? Do check the battery voltage on your TWA to make sure it's above 3.6 volts. If not, please make sure you swap for a set of three new batteries. It could potentially be a matter of compressed battery tabs as well.

Please remove the battery cover of your TWA and bend the tabs outward to make sure they're making good contact with the batteries inside. 

If it's an app problem, I'd start with with restarting your phone.