For problems with the Xamarin Android Player preview, you can first check the documentation and release notes to see if you might be hitting a known issue:
If neither of those documents mentions the problem you're seeing, please file a bug on Xamarin's bug tracker here:
Make sure to:
Create an account on Xamarin's Bugzilla if you don't already have one.
Look over the bug writing guidelines:
Zip up the log files for the Xamarin Android Player and attach them to the bug report:
Include your operating system version information.
Mention whether you log on to Windows via a company-managed domain (Active Directory).
Thanks for the reports!