problem with pmdg737ngx just before touchdown

Hi, I have a following problem with pmdg737ngx just before touchdown.

I have disabled all addons to eliminate any other possible culprits.

What happens is just before touchdown immidetly after 10""feet" gpws call out fsx will freeze for up to 2 seconds then while it unfreezes it appears as you are being fast forwarded these 2 seconds hence making nice landing very difficult.

I believe software 'pmdg737ngx' is doing some kind of calculation or loading of some files that causes it...??? Just my guess...

It only happens with pmdg737ngx, other aircraft do not have these problems.

I tried it many times many touchandgo even after freeze if I go up then back down to initiate 10 feet callout freeze will happen again, but maybe to a lesser extand.

I tried renaming all directories that contain sound files that pmdg might use to sound.back only thing that it does makes the approach silent no engines nothing but the pause of 1-2 seconds is still there.

Tried removing renaming effects folder to effects.back again no improvement and the pause before touch down is still present 

What I pmdg737 doing at this instance can it be stopped removed through unselecting some option?

Again for sure it is only with pmdg737

Thanks for any help/sugestions

Jacek Seroka