The TV cannot connect with your wireless router (or access point) at 5GHz.
Use the optional USB Wireless LAN Adapter to connect with your wireless router (or access point) at 5GHz. Then, set 
[Network] →
Poor picture on Internet Video.
Quality depends on the original video provided by the video content provider and your connection bandwidth.
Small picture on Internet Video.
Use the color buttons to zoom in and out.
Certain Internet video content displays a loss of detail.
Video quality and picture size depend on broadband speed and delivery by content providers.
Good picture quality but no sound on Internet video content.
Quality depends on the original content provided by the video content provider and your connection bandwidth.
Due to the nature of Internet video, not all videos will contain sound.
You do not see many videos in the Internet Video Guide.
Press the OPTIONS button, then select categories to view more content.
Check the [Parental Lock] ratings on the TV; some Internet content may be blocked based on the rating.
Apps are inaccessible.
Check that the LAN cable or AC power cord of the router/modem* has been connected properly.
*Your router/modem must be set in advance to connect to the Internet. Contact your Internet service provider for router/modem settings.
Try using apps later. The app content provider’s server may be out of service.
Serious Error 5006 Contact Sony appears when trying to perform [Refresh Internet Content].
This error may occur if [Refresh Internet Content] did not complete successfully. Use the following steps,
1.Perform [Refresh Internet Content].
Press the HOME button, then select [Settings] → 
[Network] → [Refresh Internet Content].
2.If the problem still exists, perform step 1 again.
3.If the problem persists, troubleshoot the Internet connection via the following:
-Check that an active Internet connection exists with a wired router, wireless bridge, or wireless gaming adapter.
-Reset the network equipment, such as cable modem, wired/wireless router, by powering off
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