I've never noticed it to be honest, and since the Wifi got extended to the "outdoor terrace", that has been my preferred location in the Flounge!
I find the terrace too noisy with the terminal noise in the background, and it can also get rather hot through the glass. Great views though.
My preferred seats in the T5 Flounge are just inside from the terrace, along the glass wall separating the 'indoor' lounge and terrace.