Outlook flashes when sending an email

Occasional Visitor

I have a Windows 2012 Server set up with RDS (Terminal Server) with Office 365 installed version 16.0.10730.20264

Multiple users working on server.  

In the past couple of weeks when a user sends an email from Outlook, the outlook screen flashes 4 or 5 times before sending the email.  Email is sent fine but the flashing screen is very annoying.

Has anyone come across this. 

 

Thank you

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