I've been running XF for over two years and have always signed in, checked the "stay logged in box" and have never had any issues. Two days ago I went to the site and I was logged out. So I logged back in. A while later when I went back, once again I was logged out. This situation happened very abruptly. I had been on vacation and was browsing the site on my phone for days without an issue. Now on all my devices I am having the same problem. Desktop, laptop and iPhone all displaying the same behavior. Everything else works as it should on the site. I have done all the usual stuff...cleared caches, cleared cookies, deleted website data and re-logged in etc. Nothing alleviates the issue. A few of my users have reported the problem too. My site is a stock out-of-the-box XF install. No add ons, no script changes ... nothing (only changed the colors when I first installed a couple of years ago). It has been working flawlessly. I have made no changes other than several months ago upgraded to 1.4x. But that was months ago and nothing has been touched since. I am hosted with A Small Orange and they have been great up to this point. I am trying to communicate with their technical support but it's a slow process and they, to this point, have not been helpful. I understand the first thing hosting companies do is point the finger at the user but unless the site was hacked it seems likely this is a server side issue. No? Can anybody advise me any other steps to take to try and isolate the problem or maybe have advice as to what I might ask the hosting company to check? Something must have been changed somewhere and I'm know it wasn't on my end. Thanks.