Autopilot not holding altitude during cruise

[specialsk]

First time I've flown this plane.

I'm using the RR passenger variant and when I got close to CL400, it dropped down to under FL390, and then went back up and then down to FL374 and has been holding there for some time. The MCP is set to FL400. 

Anyone else seeing this?

[richboy2307]

Hi @specialsk

Can't say I've seen this. Can you please check your assistance options to ensure that the AI Pilot settings aren't conflicting with the autopilot? 

 

Also under the Assistance settings, please turn the turbulence to "LOW" as the effect of the winds can be a big exaggerated for larger aircraft on the "REALISTIC" setting by default.

Thanks!