CB is executing queries every X seconds to get new messages. This is done for all users viewing CB. This may increase server load a lot in some cases. They are sometimes leaving their computers for a while, with forums opened, and then queries are executed for nothing. Why not kick them to save some server resources and bandwidth? This is why automatic log-out. And they are back online with single click.
You may wish to set log-out interval to some higher value? Like 20, 30, or 60 minutes, or more...?
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