I'm not with Laminar Research, just a fellow simmer in the UK, but like you, I sometimes put the flight simulator on 'pause' and come back later to find all is OK, just click 'pause' again and off we go!
It might be worth looking at your X-Plane 11 Log.txt file immediately after another occurrence of termination, could you upload this file next time it happens?
In terms of X-Plane 11 loading time, this will very much depend on your PC hardware configuration and the number of addon files you have in addition to the X-Plane 11 file structure itself, particularly scenery packs?
However, I timed it today and my version of X-Plane 11.31, on my high end PC, was around 1 min 55 seconds. Not sure how long yours is taking to load?
When you think that the X-Plane file structure is just over 250 GB in size and has over 200,000 files and 9500 folders, it's perhaps not surprising that it might take a little while to load many of these files to launch a flight!