Forms Droid build causes System.OutOfMemoryException

We have a rather large project involving a number of external packages and components. During the droid build I've noticed a warning from the file "Xamarin.Android.Common.Targets"

Severity    Code    Description Project File    Line    Source  Suppression State
Warning     Exception of type 'System.OutOfMemoryException' was thrown.
   at Microsoft.Cci.Pdb.MsfDirectory..ctor(PdbReader reader, PdbFileHeader head, BitAccess bits)
   at Microsoft.Cci.Pdb.PdbFile.LoadFunctions(Stream read, BitAccess bits, Boolean readAllStrings)
   at Microsoft.Cci.Pdb.PdbFile.LoadFunctions(Stream read, Boolean readAllStrings)
   at Pdb2Mdb.Converter.Convert(String filename)
   at Xamarin.Android.Tasks.ConvertDebuggingFiles.Execute() ResponseGUI.Droid   C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets   1550    Build

which points too:

<Target Name="_ConvertPdbFiles"
        Inputs="@(_ResolvedPdbFiles)"
        Outputs="@(_ResolvedPdbFiles->'%(RootDir)%(Directory)%(Filename).dll.mdb')"
        DependsOnTargets="_CollectPdbFiles">
    <ConvertDebuggingFiles Files="@(_ResolvedPdbFiles)" />
</Target>