Just FYI, the hotel is renovating many rooms right now. Somewhere in the hundreds. So many of the Club rooms including the entire 24th floor and Suites are unavailable during this period. I stay here 2-3 weeks out of every month and currently the club lounge is a ghost town. Not sure how long the work is going to take but would have thought they would avoid the F1 period which is quickly coming. Not sure if it is so extensive that it reaches to Christmas.

As a note, you can always book another room type and pay for access to the lounge. $50 SGD++ if I remember right. This is what I do as the Signature rooms are actually larger than any of the Club floor rooms so on my long stays, I book the Signature room which is in the North tower and then get lounge access added when I arrive. I also request a room on the 22nd, 23rd or 24th floors so I can just walk over to the South tower on the same floor and use the club stairs to get up or down to the Club floor if needed. No elevator needed.

Hope this explains some of the availability issues.