Email notification but no messages

Infrequently I get a notification that I have new email but when I enter MailDroid nothing is available. In this situation I can refresh but nothing shows up. It appears that usually if I close MD and reopen I can then see the messages.

I have also noticed that sometimes I see new messages in MD but they refuse to load the content when opened. If I close MD and reopen the issue usually resolves.

I have a debug log from the first scenario which occurred at approximately 7:56am this morning and can upload if that would help.