I have Opera open all the time, with various tabs such as Gmail, WhatsApp etc. I've noticed recently that if I change focus to a different tab Gmail, WhatsApp etc. time out (I don't know what the interval is) so that when I click back onto them later they have to refresh, as if I've just clicked on the URI. Is there some setting that I need to fix to stop this happening - it's not a problem as such, just annoying.