at FL300 and above the aircraft nose go all high ,the AOA goes red and the aircraft cannot gain altitude,AP ON,ATH ON why?
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For whatever reason, the thrust is only at 46%. No more power to gain altitude.
Youâre about 100kts too slow!
(TAS should be about 400ish Kts)
At those heights though, you should be flying on Mach. I think about 0.78 would be standard for an A320, but Iâm sure others will be more accurate.
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Increase the throttles to about 70%. Use the V/S and set that about +1500 ft. I see there you are low on fuel as well.
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but i didnt adjust anything during the flight ,this happend suddenly
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thank you for the feedback guys,aircraft is steady now
Getting low on gas too! I hope youâre not planning on staying up there too long. 
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You can always simulate Gimli Glider.
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btw at 0.78 mach i get overspeed warning
That doesnât seem right. I havenât flown the 320 in MSFS, so canât say if itâs normal or not, but the real aircraft should do that speed just fine.
Sorry I canât help more, hopefully someone more familiar with the MSFS model can chime in.
I know itâs strange. I did a Google research and I found that cruise speed for Neo is 0.80mach
Note that Airbus doesnât function the same way as Boeing does. You donât give 0-100% thrust and the auto-thrust doesnât move the levers between these levels. No. Airbus uses âthrust modesâ you have IDLE, AUTO, CL, MCT, TO/GA. Each of these represents a maximum percentage of thrust that youâre allowing the auto-thrust to give.
So check your thrust level⊠If your thrust lever is set to AUTO 46%. That means the auto-thrust will not give more power than the maximum power your lever is set at, which is 46%.
Move your thrust forward to CL mode (roughly around 85-90% thrust) so the auto-thrust have a lot more room available for them.
Also, make sure youâre on Managed Speed mode, itâll give you the best cruising speed and will utilise your thrust accordingly.
The MSFS A320 also doesnât function as is should due to the bug-ridden AP. Even when flying at mach speeds, you get overspeed warnings in kts, usually youâre exceeding 230 or 250 kts. Once you reached mach units, you canât reset to kts either - you have to view the speed on the mouseover on the dial. Also youâll probably lose your FMS waypoints and your speedbrake might deploy above 30k feet whilst youâre climbing - keeps you on your toes!
I never experienced the overspeed warnings in kts. With managed airspeed mode, itâs never gone wrong for me. always keeps it well below the overspeed zone. The only time I got the overspeed at 230 knots was when I take off and forgot to retract the flaps.
I also never had the speedbrake deploy on its own during climbing, cruising, or descending⊠Maybe because I never arm the speedbrakes until Iâm on final approach?
During climb your auto-throttle should be set to âCLâ instead of âA/THRâ. The notches in an Airbus are âIDLEâ -> âA/THRâ (where you have a small range of adjusting thrust) -> âCLâ (usually used for climbing) -> FLX (flex temperature, usually used for take-off) -> TOGA (around full thrust, used for Take-Offs and Go-Arounds).
If you set the thrust lever to CL you will likely notice the engines cranking up and your speed rising. Which will lower your angle of attack.
I think I ran into this issue but I noticed something changed my speed settings to selected. Then the airplane tried to use trim to compensate and eventually itâll start losing altitude.
Itâs probably related to the ghost controls that have been plaguing certain aircraft where controls leak over and change brightness knobs or other things.
Fixing my speed allowed it to get back to a respectable 5 up on the trims
Check slats up 
APOK, the basic reason as noted is because youâre going too slow. Did you ever have your hand out of a moving car window when moving fast? The faster you go the lower angle your hand has to be to hold your arm up. If you raise your hand angle, your arm raises. If you lower the hand angle, your arm drops and starts moving forward/faster. Same thing happens with a plane.