Something similar just happened to me yesterday. My condo building has multiple providers: AT&T, Comcast, and Gigamonster. Apparently a Comcast technician "accidentally" disconnected my 1gbps Gigamonster service while setting up a new Comcast client in my floor's Telecom utility closet.
I've lived in highrise complexes for the past decade and have experienced this type of outage four times. The common denominator seems to be Comcast.
A Comcast tech (who was out as a preliminary to getting a run buried to my then-unserved house) cut my ATT DSL line because he "assumed it wasn't being used." (Even though he wasn't installing anything that day)
Since then, I watch Comcast techs work, tell them exactly where to term and where to stop, and then to get the hell off my property.
I live in New Zealand and had Vodafone do the same thing when they installed the cable internet for the previous owners. They cut both the phone line and the satellite lines leading into the house. No bloody reason for that to happen, the Chorus tech that came out to fix it said he found the same problem at a bunch of other houses in the area.
In addition to what others said, support for precise garbage collection in LLVM was not ideal at the time. The experimental gc statepoint extension spearheaded by the Azul guys is trying to change that. They've been working on it publicly since late 2014.
I've lived in highrise complexes for the past decade and have experienced this type of outage four times. The common denominator seems to be Comcast.