Log into Yahoo via web browser. If you're sure your mail looks good there - you have your stuff - wipe it off the phone, restart the phone, and set it up again. If you're losing battery life fast 1) look at battery health in settings and 2) look at all your app background refresh and location settings. I see your scenario like this. It should be able to work better, you can do battery replacements, and any upgrade in the current product line will be a significant.