I own a new Samsung Ultrabook laptop. It constantly drops the wifi connection or takes it back to LIMITED. I know its not my Wifi because other devices don't drop off.

Well it depends on range, and near by electrical noise.
are you at home or at startbucks? just a clue?

get a wifi meter, install it to the book.
then see just how good you think wifi , really is.
i use. APP
insidder

it's like wifi radar. shows you the signal strength
the neighbors interference.
are you using the same channels as the neighbors.?
yes, well get off that channel and use another.
are you using G/N wifi ? if not why not.

my neighbors all use defaults, so they are on the low channels
im on the upper.
and i have 2 WIFI smart routers, to make all TV and all wifi work
in home, is home large?
i run a Dlink Dap1525 , it sees your moving about and directs the signal so you. true magic here. Love mine.

Wifi is weak, and has very limited range. unless you plan out the system.