There is already a thread on this.
Please contribute your evidence media there:
https://forums.flightsimulator.com/t/autothrust-disengages-itself-randomly-on-ps5
Also add the info, if you are on an platform different than ps5, so that the devs know whether if it is a platform specific or unspecific issue.
And don’t forget to vote there please. The thread there is also in the feedback logged state and active on the dev’s radar