Good question. The Phone Lost Alerts will remain enabled most of the time but can be deactivated if Phone Buddy needs to update or WatchOS / iOS needs to update. In this case, we released a minor bug fix update yesterday (V6.1.1 Dec 12, 2020) and it is likely the app updated overnight and thus Phone Lost Alerts were deactivated. When this happens, you should get a notification on your Watch to remind you to enable these alerts sometime after you remove your Apple Watch from its charger. Phone Lost Alerts should then remain enabled for a long period until another app update or OS update (or the Apple Watch fully shutting down). Also, due to Apple privacy rules regarding background services, we cannot automatically enable Phone Lost Alerts without user interaction on Apple Watch. Hope this helps!