This happens to me quite a bit, and it's annoying. I use the mobile site on my iPhone 6. When I write a post and hit "Post", the page freezes - it doesn't post, and I can't go back to retrieve what I've written and try again. Invariably it happens when I've written a long post! But not often enough for me to remember to copy my post in case I lose it.
Any idea what causes this? If so any chance it could be fixed?