I have a Google Nexus 10 tablet that has been running Traveler since 2012 (I'm currently running the latest version available from the Google Play Store). I've got the sync set to every 30 min peak hours and hourly off peak. The tablet will stay alive for days in standby, so I can't duplicate your issue. Setting sync to "manual" should do even better.
My experience is with Android 4.3, since I disabled the ability of it to prompt me to "upgrade" to 4.4 (KitKat) and now 5.0 (lollypop). That may affect what I'm seeing. IMHO, 4.4 was a big downgrade for Android tablets, and 5.0 is no better, with known bugs and also no useful, functional additions. But that discussion is for another forum.