WRT160NL blinking Ethernet ports and wireless LED

I have a 2-3 month old WRT160NL that has been working fine until 2-3 days ago I noticed that the Ethernet port thats connected to a computer and the wireless LED has started blinking rapidly.  Even after a power cycle that this blinking happens.  Router seems to function ok BUT by internet connect has slowed down specially the wireless part.  Any ideas?  I have a wireless printer that's connected to this router and I can not even ping it anymore. It never did this before and I have not changed any settings lately.  I have borrowed a friend's WRT160NL and no blinking on his router and provides me with a fast connection and my wireless printer works using his WRT160NL.
Any help is appreciated, else I'll probably return this router under warantee.
Thank you.

thanks for the replies.  figured out the problem.  the router is secure.  for some reason the wireless connection between the wireless printer and the router has dropped low which made the router to send out "more packets or signals" to keep the connection going which explains the very constant blinking on the wireless light.  when i moved the printer a little closer the blinking stopped.  this probably would explain my "slower" internet connections specially with wireless.  i just fiddled around with the linksys antenna and things look ok.  im just currently trying to figure out how to "extend" that wireless reach from the router to the printer -- maybe a high gain antenna.
thank you.

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