If you stop the X-Plane with: kill -SIGSTOP <PID>
Then resurrect it a couple of minutes later (not immediately!)
with: kill -SIGCONT <PID>
X-Plane crashes with:
Assertion 'pa_atomic_load(&b->pool->stat.allocated_size) >= (int) b->length' failed at pulsecore/memblock.c:194, function stat_remove(). Aborting
Before, with Pulseaudio 5.0 on Ubuntu 14.04 this didn't happen. On Ubuntu 16.04 with Pulseaudio 8.0 it is recurrent. Please investigate!