Connection issues with android app

Hi. Recently got the problem that my android devices (running samsung host on a galaxy a3 for example) cant be accessed after the device is not connected and in idle mode for some time (same with several other devices). I could need help for settings to still show it under online devices even if the screen wasnt unlocked for a while.
Hope someone can help me here.
Greetings,
Atzlinger_s

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