Don't have this with the other forums I frequent. Other than the site, only the browser would have an effect such as this, and it has no control over how a site times out. I'm on a completely different system than when i first started posting here, but the experience is the same.
Most forums have some sort of control over the user's time use, but this one has been the most aggressive by far. And it is the only one that has me logged on and off at the same time. A great example of Schrodinger's cat. If there as a control I can set, would appreciate learning about it.