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It might be because my internet isn't always good, so I have to have that in mind, but it happens, sometimes my sessions is logged off, sometimes I'm still logged in (keychain). I have always my profile or the notifications section opened in my browser, and once a week it just lost the setting I have saved, and I have to save them again, sometimes it happens the first time in the day when I enter the page, sometimes while I'm using it.