Streaming HD video over wireless is always hit n miss depending on interference from other electrical devices and your neighbors wireless.
Replace the wireless with MOCA and verify you internet connection to the router is working ok and things should improve.
Then again, hiccups and re-buffering is the nature of streaming video from a remote network location and why I do not use it for home theater application.
Current : Roamio Base with 2TB drive and 2 Premieres and a mini. OTA. kmttg, pyTivo, running with a 78TB Synology 1511 NAS....serving up the world.
Setup help for pytivo under windows:
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