Here are some tips to keep Biz Daemon running in the background and it can prevent your Samsung device to appear offline.
The steps may vary due to the variety of devices or Android OS versions.
Disable battery optimization on Biz Daemon (Android 6 or above)
Open AirDroid Business Daemon > tap on Ignore battery optimizations > Get permissions and tap Allow to stop optimizing battery usage.
For Android 8 or below, please refer to the following settings:
Adjust the Power Saving mode
For Galaxy S4 and below:
Go to Settings > My device > Turn off Power saving mode
For Galaxy S6 and above:
Go to Settings > search "Smart Manager" > Battery > Details
After that, tap on Biz Daemon under App power saving > Tap on Disabled.
Keep WLAN on during hibernation
For Galaxy S4 and below:
Go to Settings > WLAN > More > Advanced > Allow always keeping WLAN on during sleep.
For Galaxy S6 and above:
Go to Settings > Wi-Fi > More > Click keep Wi-Fi on during sleep.
Set Biz Daemon as an Auto-run app
Open Smart Manager > Auto-run apps > enable Biz Daemon
If it is not applicable to your devices, please skip this setting.
For Android 9 or above, please refer to the following:
Select Not optimized for Biz Daemon
Go to Settings > Search "Apps" > select Biz Daemon > tap on Battery.
After that, tap on the arrow icon and select All > tap on Biz Daemon to disable Optimize battery usage > you will see Not Optimized as in the screenshot.
Lock Biz Daemon on the recent page
Tap on the Recent button (it looks like 
and you can use it to switch between different apps) > long-press Biz Daemon icon > tap on Lock this app > you will see a Lock icon on Biz Daemon.
Disable Auto optimization
Go back to Settings > search "device care" > tap on 3-dot icon
After that, tap on Auto optimization > turn off Auto optimization.
For Android 11, please refer to the following:
Enable "Allow background data usage" & "Allow data usage while Data saver is on" (Mobile Data applicable)
Settings > Apps > Biz Daemon > Mobile Data > Enable "Allow background data usage" AND "Allow data usage while Data saver is on"
Allow background activity & Put Biz Daemon to Never Sleeping apps
Go to Settings > Apps > Biz Daemon > Battery > make sure "Allow background activity" and "Optimizing battery usage" are enabled.
If Optimize battery usage shows "Not optimized" and Allow background activity is greyed out, please tap on Optimize battery usage and select All, then enable it for Biz Daemon.
Go back to Settings > Battery and device care > Battery > Background usage limits > disable "Put unused apps to sleep" > Never Sleeping Apps > Add "Biz Daemon".
Lock Biz Daemon on the recent page
Tap on the Recent button (it looks like and you can use it to switch between different apps) > long-press Biz Daemon icon > tap on Lock this app > you will see a Lock icon on Biz Daemon.
Developer options
If Developer options is available, please refers to the following:
Go to Settings > Developer options > Limit Background process > tap Standard limit
