I have the Note 4 and could not find a "menu" under data usage. I did, however went under Accounts and then went to my Microsoft Exchange Active Accounts where I found that all of my e-mail folders were set to "manual" sync. I changed all of them to automatic sync for every 5 minutes. But, that didn't work either. I also found a setting to "sync e-mail folders" for every 5 minutes. I tried that and IT WORKED GREAT. Your answer led me to the correct path. Thanks for your help