Simply restart you box fix most of problems.
Reduce sharpen of your TV (sony, LG, Samsung etc) setting to zero and adjust contrast and brightness may improve picture quality. To adjust setting using your TV remote. Please check HDMI Settings.
A. Internet test
Real TV run on internet and consume high bandwidth. 99% of time problem is due to your internet. Follow step to check your internet speed
• Please check your internet speed (http://www.speedtest.net ) and should be more then 3Mbps stable check 4 to 5 times.
• Most of time internet problem fixed by just switch off your modem/router for 1 minute and then restart back or reset your modem
• If your device not getting enough speed then pleases contact your internet provider.
IF you device is connect with WIFI
B. Need to check WIFI signal strength
Check you WIFI network strength which will show in percentage. If you have less than 99% signal strength. Please check your modem setting or get better modem.
Adjust the aspect ratio of your TV ( Your TV set sony/samsung/LG etc) to 16:9 format.