These RF extenders are prone to EMF and other RF interference. Make sure that your extender is 1) Not behind your TV 2) not next to a speaker, 3) not set to the default extender ID and channel ID (try others besides 0,0).

Look @ these 4 threads from this search for other tips as well as 900Mhz cordless phones can affect reception as well.

[Link: remotecentral.com]