  We present tunneling measurements of sub-micron metal/insulator/graphene
planar tunnel junctions up to room temperature. We observe a gate independent
gap, as previously observed only by low temperature STM[Y. Zhang et al., Nat.
Phys. 4, 627 (2008)]. No gap appears at temperatures above 150K, which is four
times smaller than the theoretically expected $T_{c}$, from the accepted mean
field model[T. O. Wehling et al. Phys. Rev. Lett. 101, 216803 (2008)]. We show
that taking into account an additional vibrational effect of out-of-plane
phonon soft modes the gap may disappear from the measurements at temperatures
much lower than the calculated $T_{c}$.
