@davidlans Good day, 

Thank you for your valuable feedback.

Please turn on Notification on a lock screen and lock Tapo app on your Samsung phone and see if that helps. 

Also make sure your Tapo app & Tapo C310 firmware are both up-to-date. 

SAMSUNG

Tips 1: Prioritize notifications of Tapo/Kasa app

1.       Open Settings -> apps

2.       Select Tapo/Kasa app

3.       Go to the Tapo/Kasa app settings ->Notification

4.       Toggle ” Notification” to on and Set as priority.

Tips 2: Turn on Notifications(Lock screen)

1.       Open Settings -> Notifications-> Notifications(Lock screen)

2.       Toggle on “show on always on display”

3.       Go to Do not disturb>Apps, select Tapo App and make sure “Do not disturb” is not applied to Tapo

Tips 3: Turn off battery limit

1.       Open Settings  > Battery>Background usage limits

2.       Add Tapo/Kasa to list of “Never sleeping apps”

Tips 4: Lock the app

1.       Tap the Menu button to check “recent pages”.

2.       Tap the Lock Icon of Tapo/Kasa to lock the app

3.       Tap Done to complete.

If still the same issue, may I know the Android version of your Samsung S10 & Tapo APP version, thank you.