It's being reported[1 - NYT] that the 107 "turn off time" is inaccurately quoted. It wasn't that the system was turned off at 107, as much as the next expected report at 137 was not received. This leaves a 30 minute window during which the system was disabled. Note also that the last voice communication was at 119, so it could have been disabled after that. We simply do not know.
[1] http://www.nytimes.com/2014/03/18/world/asia/malaysia-airlin...