a wierd speed issue has recently started to pop on my my 737NGX 700. After Takeoff - my plane wont go above the speed of 200-204 knots in any conditions. I checked all flaps and speedbrakes and everything and issue remains same and hence VNAV wont start the climb and I end up flying around 9-10k alt.

 

Just recently popped up :(

It would help enormously if you gave us a screenshot of the panel when this happens. Probably something simple that is overlooked.

 

Please also note that PMDG required full names to be signed to posts for support. Without it, you likely won't receive any help.

check the temp outside. could be to high. maby a whether generator problem