iOS update throwing me out of mumsnet, Facebook etc. anyone else have this prob?

[FunnyCatVideo]

My iphone automatically updated to ios8.4 (I think!) the other day & now on safari I keep getting chucked out of here and Facebook. Is this just me? Anyone know how I resolve this?
Ta

Here is the current thread about the same problem, you are not alone !
HERE

Thanks - had a look earlier so as not to repeat a post, must have missed this, sorry