Imac freezes when listening to NPR for halfway through Youtube videos, etc

Hello,
I am having a problem with my iMac, and other post didn't seem to touch on this exact subject:
Everytime I am listening to NPR radio (online newscast stream), the stream will freeze repeatedly, thus essentially disabling me to listen. Also, this will occasionally happen when watching video on Youtube, Vimeo, etc. My iMac doesn't itself freeze, just the newscast/video. Is this a problem with my computer?
I installed an extra 4GB of RAM, thinking this would help, but to no avail. In fact, it seems worse. Anyone know what might be causing this?
Thanks in advance,
_ j

It's probably nothing to do with your iMac but the stream coming from the provider. Where I'd begin looking is your w-fi settings. For example if you live in an area with lot's of wi-fi networks you could be competing for bandwidth with your neighbors. This can be easily solved by changing the wi-fi channel. Most wi-fi networks use channels 5 or 6 as their default channels and most users are too lazy to change the channel although there are 11 to choose from. My recommendation is to download and install iStumbler and see which channels are being used.Then it's a simple matter of changing your channel. If you're using an Apple router (Airport Express, Airport Extreme or Time Capsule) then simply launch Airport Utility and make the change. If you're using a third party router then look in the manual to see how to change channels.
Roger

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1. Product Name and Number
Product Name: HP Pavilion g6 Notebook Pc
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Imac freezes when listening to NPR for halfway through Youtube videos, etc

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