I've tried everything. Power Saving is off, putting apps to sleep is off, phone sync is on, background sync is on, gmail sync is on, I deleted my Google account and added it back, I cleared the app data and cache, made sure everything is updated and finally FACTORY RESET MY PHONE and my gmail account still doesn't sync to the Gmail app on my phone unless I open the app and manually refresh, restart my phone or turn sync for gmail in my Google account on the phone off and back on. All of my other Google apps sync correctly automatically (calendar, contacts, etc). This is driving me nuts. I've been missing so many emails because I have to manually sync now. Please help! It only started doing this out of nowhere recently.