Configured native Samsung email and Touchdown for Exchange on Samsung Galaxy Tab 10.1 4G LTE from Verizon successfully to our corporate OWA server. After 12 to 24 hours these two applications can no longer make a connection to sync mail. Administrators of Exchange insist they are not making any changes to OWA or Exchange servers. Has anyone else seen this behavior on any Droid device before? This has occurred on two new out of the box Samsung Galaxy Tab 10.1 4G LTE and Droid2 with Android version 2.3.3 too from Verizon.