There's a bug with device control/Smartthings on ONE UI 7 where if you open device control to manage a device (turn on/off etc) then go to the recents apps to close it or just to switch apps, device control disappears and the phone has a small lag after that.
We appreciate the detailed observation. It sounds like you've encountered a bug introduced in One UI 7 affecting the SmartThings Device Control panel, especially when switching apps or using Recents. The behavior you described disappearing controls and a slight lag wasn't present in previous One UI versions, as you noted.
We recommend sending an error report directly to the development team through the Samsung Members app.
Samsung Members app > Support > Error reports > Choose category > Include system logs.
We’ll also pass this along internally for further review.
