Has anyone had the LG G3 stock email app delete emails on the actual email account?

[AC Question]

I've been using the manufacturers email app provided on the LG G3 and just noticed that it has deleted emails without warning. It has happened before and I've lost important emails without understanding how and now I am positive it is the email app as I again lost another important one only minutes after receiving it and checking on my computer first and then my phone (which it was refreshing and deleted that single email). I was wondering if this is an occurence with any other users as well? And if there is a fix for it?

Thanks