Yeah, I experience the same when doing longer flights (2:30h and above). Especially when landing in high dence areas (big cities, much traffic, big airports, heavy weather/clouds). We are following that issue. But we are not sure yet, how much of the CTD is A32NX related, and how much is MSFS related. MSFS still seems to have a memory leak somewhere. And the A32NX team is still in the process of tweaking the performance of the code.