Thanks for the replies Stintsonddog and Roofus.
Tried the very invasive (for me) foray into the guts of my rbt-2010 suggested by jav at the following link: GpsPasSion Forums - SiRFdemo tutorial (advanced configuration)
Scroll to near the bottow of the page and look for his post with the accompanying picture.
Not for the faint of heart as taking the thing apart is a bit of a chore.
This fix seems to have worked for others, but no dice for me.
Will try the other fixes related to taking precautions to insure unobstructed signal while obtaining a cold fix, but I've never had the slightest bit of problem with this before and nothing has really changed, so I'm starting to think my rbt-2010 has breathed its last.