I have experienced this problem on Mac, Windows 7, Windows Mobile 8, Linux, Android 2-6, Chrome, FireFox, Android Browser, Chrome OS, Cellular network, Cable Modems, Phoneline connections, in the UK and the Netherlands.
I really don’t think it’s us, it’s either your software or some user accounts that are the problem.
Yeah it’s not the end of the world, but it’s really annoying. Especially when you have a very slow internet connection* – I want to use the forum as it’s mostly text, but then it logs out and makes me wait some considerable time to load the page.
*This isn’t your problem, but it makes it more annoying.