Here are some tips to keep Biz Daemon running in the background and it can prevent your device to appear offline.
The steps may vary due to the variety of devices or Android OS versions.
1. Disable Battery Optimization
There are 2 methods to disable battery optimization on system settings:
Method 1:
Go to Settings > Apps & notifications > tap on Biz Daemon on Recently opened apps (or tap Biz Daemon on all apps) > Battery.
After that, tap on the drop-down menu and select All apps > select Biz Daemon and tap on Don't optimize.
Method 2:
Go to Settings > Battery > tap on 3-dots icon > Battery Optimization > tap the drop-down menu and select All apps > select Biz Daemon and tap on Don't optimize
2. 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.
3. Keep WLAN on during hibernation
Go to Settings > Wi-Fi > Advanced settings or Advanced Wi-Fi > Keep Wi-Fi on during sleep, tap Always. If you have Wi-Fi Optimization on your devices, please make sure to disable it.
Tips: If you use mobile network, you can skip this setting.
4. Developer options
If Developer options is available, please refers to the following:
Go to Settings > Developer options > Background process limit > tap Standard limit
