Aaaggh! Had to re-write this because it happened while typing up the thread!
This only happens on Mumsnet. I'm using the mobile site through Safari on an iPhone 4S, iOS 8.
Every time I attempt to comment on a thread, it freezes Safari completely mid-typing. I could be halfway through a few sentences or it might let me go as far as typing a whole paragraph, but the whole thing freezes. I then have to click the button on my phone to get out of Safari. When I click back on it, the page reloads, logging me out, thus deleting anything I've already written. I then have to log back in and type it all again, keeping my fingers crossed that it doesn't happen again!
I've started typing up my replies on my Notes in my phone first so I can copy & paste straight into the comment box. But even this is difficult because the paste option flashes up and disappears several times before it finally stays up and lets me click on it. Again, this only happens on Mumsnet. I use other forums and websites and this never, ever happens.
It's driving me mad and limiting my time on here because I get annoyed with typing everything twice!