Galaxy S9 using the Samsung email app for several (3) email accounts. One is a gmail account that I've previously had no issue with. Now lately, it will randomly not load the gmail. It says it is syncing and shows no errors, but if I go to the gmail app, I'll have several emails waiting. Sometimes it will load up one or 2, sometimes nothing, sometimes all of them. This is a new problem over the past couple of weeks. I haven't made any changes to the phone.
I was looking at other apps to try yesterday, but decided to try deleting the Samsung app and reinstalling (take note of your account setup first!). This is seeming to work for now.