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I have a solution that is like Android -> Android -> .netstandard2 -> .netstandard2.
Upon solution rebuild the bottom .netstandard2 project can't:
error MSB3027: Could not copy "obj\Debug\netstandard2.0\PROJECTNAME.dll" to "bin\Debug\netstandard2.0\PROJECTNAME.dll". Exceeded retry count of 10. Failed.
Of course, restarting VS does the trick for a build or two.
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MSBuild is holding the file. I didn't spot it before because Windows 10 Falls Creator update now groups MSBuild processes under VS.
This looks very similar to https://bugzilla.xamarin.com/show_bug.cgi?id=60164. In that case, Fody PropertyChanged was locking the file. The fix if you're using that is super simple: just upgrade Fody (not the weaver, the root package) to 2.2 or later. With .NetStandard you'll need to actually install that package. The dependency that you get automatically is 2.0, which has the bug.
Please let me know if this looks like your issue.
Indeed, I'm using Fody, and was using <2.2.0. Upgrading to 2.2.1 seems fixing the issue, so I'll close this bug.
Thanks very much,