just go to the galaxy store application and download the email application. If you can't find the samsung store application, just search 'galaxy store' in your phone finder (swipe up or down from the home screen) and it will bring up the galaxy store. search 'samsung email' and download the app.
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Yes it most likely does. I would recommend backing up your phone to your computer, and factory resetting it if possible. Then you can use it normally for 24 hours and see if you have this issue again. If not, you know for a fact it is something you installed on the phone. I highly recommend putting the minimum apps you need for day to day use back on and seeing if the issues persist. If not, you keep repeating this process one by one until either you find which app causes issues or you don't have the issue anymore. As a rule of thumb I would also make sure all of your apps are up to date and that your phone is up to date with security and os updates as well.
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