problem during take of flight and climb with 737 ngx

Hello,Since i used the last update of fsuipc (registered version) and AS2012, i've got a problem with my pmdg 737 ngx during the climb just after took of.The plane start to accelerate and climb and few time after stay at a very low speed and stop climb.I post a thread on pmdg forum, a person said to check TAT during the climb phase.http://forum.avsim.net/topic/359283-buffet-alert-and-autothrottle-disconnect/page__pid__2225515#entry2225515 Well before these updates, i never had this problem.Could you help me please.Thanks in advance.

Edited January 14, 201214 yr by grandfred29