The same thing happened to me also.in past some days sometimes i was unable to load the Steemit site or i need to wait too long to get it open.once a day i write a post but after sometime when i see my blog i found there was no new post and i need to write my post again.
but as i know about the steemit platform ,steemit is working on it to solve this problem as soon as possible
Have a good day