I understand you have screen mirroring issues with your PC.
Don't worry I'd like to help you out.
Did you make any software or hardware changes to your PC?
How is the laptop connected to the Samsung TV?
Confirm that the display you want to project to supports Miracast. To do this, check the information that came with your device or go to the manufacturer's website.
If the display supports Miracast, continue to Step two: Projecting your screen.
If the display you want to project to does not support Miracast, you’ll need a Miracast wireless display adapter (sometimes called a dongle) that plugs into an HDMI port on the display. The adapter allows your computer to communicate wirelessly with the display device.
A variety of manufacturers offer Miracast adapters, such as the Actiontec ScreenBeam Wireless Display Receiver and the NetGear Push2TV (PTV3000) Wireless Display Adapter. Follow the manufacturer’s instructions to connect the adapter.
If the issue still persists try updating the graphics driver and wireless driver on your PC and check if it helps.
Please update the graphics drivers using this link.