There are 3 things to consider here:
- Device specific battery saving modes: They have been here for some time and getting (from an App developer perspective) worse with every update. Setting the “battery management” to “not automatic” (or similar depending on UI) normally helps here and we give warnings for this in the Nuki App if someone activates Smart Notifications. Though some devices still seem to ignore those settings in some cases (see https://dontkillmyapp.com)
- Android Pie general battery saving / handling of background tasks for Apps: To solve problems here we introduced a solution which resulted into a (permanent) notification that the Nuki app is running in the background
- Samsung Galaxy specific BLE issues introduced with their new flagship devices (and Android 9 updates for the older ones): That’s what the current Alpha version adresses (only for those devices)
As you commented in a topic which was before focused on the 3rd point I assumed you faced the exact same problem. My apologies if this was a wrong assumption and I therefore may have answered confusing for you.
Still it would help us if you send send a log-file with the exact time when it occured to our support team at contact@nuki.io, so they can check the details of what happend (if you haven’t already done!).