Have you tried making those selections by "Named Selections"?
Are those the two the most up-to-date versions that you are entitled to?
What exactly happened before this bug started? did you change anything? is this file specific or a computer specific issue?
We talked about the named selections and that is what we will try if we can't get it to stop losing the surfaces.
Yes those are the versions we're stuck with until later this year.
When we upgraded to SW 2016 from 2014 it started happening. Though for some reason the problem does not present on my computer; we can't see any difference in the settings between the programs, and have tried reinstalling multiple times.
Turns out that upgrading/updating to latest version of Windows 10 fixed the issue.