|I don't know about diminishing capabilities but I do know the SOHO router I was given by my ISP when I first signed up with them was a combo unit. After a few years, the wireless would suddenly stop working altogether. A quick reboot fixed it. Over the course of a year or so, the frequency with which I had to reboot it for that reason increased. Eventually I bought a replacement and had them ship me just a plain old modem.|
But that's a case of the wifi completely stopping functioning.
I've never heard of 'diminished capacity' as you describe it and to be honest, it seems unlikely.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.