Restart on the PC is one of the most common. Android phone is the most robust, rarely have a loss on it. 2 PCs that I have at home that usually keep a firefox window open at all times have intermittent losses, but can easily happen a couple of times a day. I do not seem to remember a time where I lose my login when I have stayed on the site for a period of time. It is usually when I come back to the site after being gone for some time....

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