News has consistently been reaching us over the last couple of northern hemisphere summers and from both sides of the pond.
NG's, both 700 and 800 have not behaved as advertised at or close to FMC max level. It's equally interesting how the airframes have stayed out of the news as well as the intended flight level.
Advice from us at the Towers is to confirm updated, real, environmental conditions/weight and check the QRH cruise tables before the final part of the climb.
That's QRH/Flight manual not the FMC.
Regards
Rob