I was tasked with resolving the "no synch" email issue with my wife's newer S8. I had no luck after trying the procedures offered on this forum including those provided by Google. However, I had a eureka moment and decided to put myself in Googles marketing heads - how can we make more $$$$$. The very first place to check is the amount of memory you have devoted to the Cloud. Go into your account. At 15gb or more Google toggles off your email and stresses the need to pay for more memory. Or if you hunt a bit more you can compress those photos and videos that have been gathering since your first phone. In any case, manage what you save. Yes, my wife's email issue was resolved immediately