So the 'F-35B grounded' idea came to you as an early 'the sky is falling' moment? No links huh. Oh well the closest I can get today is a story about F-35As at LUKE AFB in 'merica wot are still puzzled by the oxymoronic hypoxifyingly difficult to solve OBOGS issues - but they still fly under 25,000 feet whilst no other base or variant of F-35 is thusly obliged.
Air Force looks toward lessening F-35 flight restrictions at Luke AFB 15 Aug 2017