Something I've seen happening is that much of the map data vanishes.  Raods, railways, rivers, urban areas, circuit patterns, noise abatement areas etc.  These ae all enabled.  I got them back by logging off, powering off my iPad, turning it on, restarting and logging on.  That's more than I will do in flight and even away from home I may not have an internet connection.

Could we have an option to reload everything that's easier to do please.

version 3.13.6.238.

I am very familiar with the local area and noticed a major road  (A34) that I was flying along was missing on the SD map.

I checked the SD settings (while flying) and found roads etc. were unchecked. I definitely hadn't done that.

I wonder if SD, during an update, failed to save previous user selections?

I use Android on a Samsung S8 smartphone.V 3.13.6.18418

Tony