I have recently bought a Vivofit 4 to replace my Vivofit 1 (I loved my Vivofit 1, but unfotunately after 9 years it died ). I have had nothing but problems trying to sync the Vivofit 4. A lot of the time the information is not correct or it does not sync. I find that I have to have the phone next to the watch or have it next to the ant. Also occasionally some of the settings return to the defualt settings and I need to go in to settings and re-adjust them. I am using the ant from my vivofit1 and wondering if that is the problems? Does anyone have any solutions?