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You can stop the emails by changing your Notification preferences @catluvmatt
Click on the bell-shaped symbol at the top of your screen. You might have to click on your Avatar first.
Once you have clicked on the bell you will see something similar to what you can see below
Click on the 'sliding switches' icon that you can see and you will then be able to select which emails you want/don't want.
The only time I get asked to sign in is when I delete my browsing history. Clicking 'keep me signed in' does not work if you select delete 'cookies and site data'
Please make sure there isn't something on your device that is automatically deleting your data and site preferences.