It is happening to a very small handful of customers - that is making it very difficult for us to identify the cause of the issue. Also, those who experience it, dont experience it all the time - so it makes it even more difficult for us to reproduce our side. But - we are looking into it !
Probably the first question to ask - those who have experienced this issue - do you have a Nvidia or AMD graphics card?
I have Nvidia 
RTX 2080 super. Maybe it’s related to MSFS issue with flickering reflections? I get those too.
When it happens how can we help debug it on our end?
Full new experience of the sim with this bird
You hit the nail on the head - we dont have any way to debug in MSFS! 
Got the bug, nvidia
Well, i try reinstall my drivers for graphics card. I will let you know if it helps 
Yes, and that is accurate. The autopilot trims automatically - especially with speed changes in climb and descent, and that is how it sounds in the real aircraft.
After my first enjoyable flight I got a very horrible warning hooter just as I started to taxi to the terminal. I could find no way to stop this. Has anyone got the answer for this please ?
PMDG used to provide a full set of official Boeing manuals with the aircraft - FCOM, QRH etc. They had to obtain a license from Boeing to do that. You cannot redistribute official copyrighted aircraft documents without permission from the manufacturer. For whatever reason, that license was not renewed - perhaps the cost increased to the point where it was no longer possible.
That said, there are PDF copies of the Boeing manuals available online, easily found by a Google search - apparently Boeing has taken no action against the sites that distribute them, but since PMDG has to maintain a good working relationship with Boeing they are not going jeopardize that by including links to where the manuals can be found.
You did find the manuals that came with the installation I suppose?
Did you disconnect the AP on landing? Is that the warning sound you’re hearing? If so, click the AP Disconnect switch on inside of the left-hand side of the yoke.
Have you tried pressing this button? For me I had this non-stop alarm going off and this helped for me to stop it .
That horn means you’re causing your pax and crew to suffer from hypoxia. Better to learn how to managed cabin pressurization (which is the system it’s connected to).
Question: The manual says to use z for disconnecting AP and then use it (z) again to stop the warning sound, because if you use the “disconnect autopilot” lever the sound won’t stop.
But doesn’t using z twice engages AP again though??
I need to experiment more with that scenario during a free flight…
Is it when we not set cruise altitude and landing altitude to the right of that button? I want to learn
How can I prevent it from happening? Thanks in advance.
And here i am being proud of myself for studying the manual all day and missing this. Thanks.
Make sure you have the Cabin Altitude set (8,000’ is pretty standard), and your packs set to Auto or High, and engine bleed air switches set to On. Once you are sure you’re not returning from your departure point and before you begin your approach, be sure to set the Landing Alt switch to match the altitude of your landing field so the pressure differential will be low enough to open the doors.
Hi,
Make sure that both engine bleed switches are ON both packs and the isolation valve are in AUTO.
