Hi Shahid, We appreciate your feedback on Prime and YouTube Videos that are unresponsive, and for optimal performance, we ask that you please ensure you've got the latest firmware version installed on your DU6900 TV. You can check this by going to Home > Menu > Settings > Support > Software Update. You may also want to further optimize performance with the self-diagnostic tool, which checks memory, frees up unused cached memory, and closes background apps. Go to: Home > Menu > Settings > Support > Device Care > Start Device Care. If you’re experiencing issues with the Wi-Fi connection, we suggest you try the following: 1. Use 5Ghz Wi-Fi if possible 2. Try wired LAN if available 3. Try repositioning the router so there are no obstacles between your TV and the router 4. Try running a cold boot on your TV. To do so, hold down the Power button on the Samsung TV remote until the TV turns off and then on again. This should take about 5 seconds. If you need more help, Samsung is here for you! Please call us at 1-800-SAMSUNG, 8 AM - 12 AM EST, seven days a week. Our LiveChat agents are also available by clicking on the ‘Support’ link on our website. ~ Samsung Advisor

Bluedemon, We appreciate you sharing your experience with the DU6900 TV. Your feedback regarding image quality is essential to us and will be shared with our internal teams. Please try adjusting the below image settings to improve your picture. Go to Home > Settings > All Settings > Picture > Picture Mode and select the mode that best fits your usage: 1) Standard: Default mode suitable for general viewing environments. 2) Natural: Reduces eye strain for a comfortable viewing experience. 3) Movie: Most suitable for watching TV or movies in a dark room. 4) Dynamic: Makes the picture brighter and clearer in bright viewing environments. You can also go to Settings > All Settings> Picture > Expert Settings > to manually fine-tune your image. If you need more help, Samsung is here for you. Call us at 1-800-SAMSUNG, 8 AM - 12 AM EST, seven days a week. Our LiveChat agents are also available by clicking on the ‘Support’ link on our website. ~ Samsung Pro