Lost authorization on the site.

I do not know why, but from time to time Habrahabr will log me out. And quite often. Regularities do not notice. Sometimes when you open another page login again, without any action on my part. It seems it's not in the cache. IP should not be changed either - the truth is that it’s an Internet connection to the adsl-modem, and I don’t know how often it changes the address.



For example, yesterday wrote a habratopic. I open it again, edit it, and when I try to save it, the authorization has already disappeared.



Actually, why am I writing - I want to ask, do I have one such problem or does this also happen to someone?