If your WI-FI is struggling to connect to your Sony TV, This video will show you the best ways to troubleshoot your WI-FI connection. The simplest solution to most WIFI issues, is to bypass the WIFI entirely and use an Ethernet cable to connect your TV to the internet directly. This has the added benefit of being the most stable connection possible.
This video supports subtitles.
How to turn captions on or off when watching Internet videos from YouTube.