I don't work for Grace, or Receiva, or anybody else even remotely connected to this product. But I do work for somebody else, where I do networks (and lots of other stuff). Your kind of complaint has a lot of possible variables. To detect the cause, you've got to check some things and test as best you can.

First thing to check: wireless signal strength. The IR2000 has a place to check that. Get to the main menu, Settings -> WiFi Strength. Every time you punch the SELECT knob, the radio will display the real-time signal strength as a percentage. ("Percentage of what?" you ask. Good question.) Treat that percentage as if 100% percent means "radio's right next to the wireless access point" and 0% as "you're way too far away from the transmitter". My IR2000 doesn't buffer much under normal conditions, I average right around 80% signal strength -- my radio is about 15 feet from the transmitter. Certain frequencies in the WiFi range are shared with things like cordless telephones ... consider changing your WiFi broadcast channel, maybe that will help if you suspect interference. If this is your problem, put the radio as close as you can to the WAP (wireless access point). Or consider getting something called a "repeater", and put that close to your radio.

Next thing to check: how much bandwidth have you got? How much are you actually getting? "Buffering" means that what the radio expects to play right now isn't there yet. This can be caused by your WiFi transmitter being underpowered, interfered with, or too far away; your ISP connection (most likely cause) feeding your connection slowly or intermittently, or even the server at the radio station of origin being overloaded. Often it's just a matter of the routers between the signal originator and your ISP being busy. They usually keep up, but not always.

How much bandwidth you need depends on the signal the radio's trying to play; but in an ideal world, even the slowest of ADSL lines should be more than enough. But if you're running dial-up access, I don't think you're going to have much success. If you have a big fat pipe (cable modem, for example) coming into your house that's going to your machine and only your machine (Are you sure? What kind of security have you got on that wireless access point, anyway?), bandwidth shouldn't be a concern. If you share that signal on what we used to call a Local Area Network (LAN), then other users of that bandwidth may be interfering with your ability to get a steady signal at the right speed.

To test your WiFi performance, you need a clean environment. Put your Internet Radio right next to the WAP, make sure no other station on your network is using bandwidth, make sure nobody else in your neighborhood is swiping your bandwidth (a frequent cause of WiFi misbehaviors!), and see if you can get a measurement of your bandwidth capacities at some place like www.dslreports.com. If you can get 100% clean performance from the radio in your test environment, start changing things back to their real-world conditions one at a time and see what happens after each ... see if you can isolate the (hopefully just one) cause.

Good luck!