If you were not having trouble before you replaced the router, you probably have another device competing with the signal - so try changing the channel as recommended. You can go into the "settings" menu of the squeezebox and see what your wireless signal strength is. If it's below 50% you could have a problem on high-rez files.
music drop out--new router
I use my Logitech Squeezebox to play music files on my computer via wireless router, which was recently replaced. I am getting frequent drop outs now, especially with high resolution files. Is this likely related to signal strength/reception from the new router? Is the best remedy a range extender/amplifier for the router?