Pressed CS pretty hard and they caved and said its "unexpected optical signal loss".
I'm speculating here, but my guess is the MRT construction guys must have dug and cut through a cable in the process.
Idiots did the same to TNB cabling earlier this year and my block had no electricity for 3 days. Good thing I was away during that time.
At least TNB we pay for what we use, unlike TIME!
Fingers crossed they get it sorted quick.