Intermittent build issues

I occasionally see failures about FxCop dependencies not being found, which then go away when I retry the build. If you see them, just re-try

One looks like this

Project : error : CA0001 : The following error was encountered while reading module 'Fake.DotNet.Cli': Assembly reference cannot be resolved: Fake.DotNet.NuGet, Version=5.23.0.0, Culture=neutral, PublicKeyToken=null.
Project : warning : CA0067 : Directory 'C:\Users\runneradmin\.nuget/packages\microsoft.netframework.referenceassemblies.net472/1.0.3/build/.NETFramework/v4.7.2' was not found.
Writing report to D:\a\altcover\altcover\_Reports\FxCopReport.xml...

another like

Project : error : CA0001 : The following error was encountered while reading module 'Fake.DotNet.MSBuild': Assembly reference cannot be resolved: StructuredLogger, Version=2.1.0.0, Culture=neutral, PublicKeyToken=d4c7181801cb6448.
Writing report to C:\Users\steve\Documents\GitHub\altcover\_Reports\FxCopReport.xml...