What is rebuffering?

Rebuffering is caused by the interruption of wireless signal. Wireless communication isn't as reliable as wired connection so using wired connection should eliminate the problem. If it doesn't than there is something wrong with your Squeezebox.

You can also try the followings:

1. Change the setting in the wireless router to operate in a different channel.

2. Move the wireless router away from Microwave oven and cordless phone to reduce interference.

3. Upgrade wireless router firmware to the latest version.

4. Although you have a "N" router, Squeezebox doesn't use the new "N" standard. It operates in the older "g" standard which is less immune to noise and has a shorter range than the "N" standard. You can buy another N router and configure it as a WiFi to Ethernet bridge (note, not all WiFi router can be configured this way, one I know that can is the Apple Extreme Base Station). You than connect the ethernet bridge to the Squeezebox with a wire and let the bridge communicate with your existing "N" router thought wireless in the "N" standard.

Just a quick reminder that your local network (wired or wireless) is not the only possible source of transmission delay. The problem could be occurring due to delays at Rhapsody's end, your ISP's or somewhere in between those two. There have certainly been many times over the years when I've waited longer than normal for a web page to load due to some burp in the network outside my home.

Sidssp has good recomendations.

Devices like the Squeezebox and Roku Sounbridge have an onboard memory buffer or cache that is used to store bits in advance of the time at which they are needed downstream by the DAC so they do not have to be received in -real time.

Rebuffing means the bits are not arriving over the wireless connection fast enough to keep the music playing.

Its commonly due to a weak wireless connection but not always. Sometimes it can be that the source is not able to put the bits out fast enough due to demand or other technical issues.

Most likely in your case its the wireless connection speed, which is good because you have control over that and not over the Rhapsody source. Try to get the router closer to the Squuezebox if possible and also look to see if there are any solid objects in the line of sight between router and box that might obstruct the signal. REposition to avoid obstructions if possible. Metal ductwork hidden behind drywall, metal appliances and such can be the culprits.