I have the same problems Judo, plus it's hanging a long time "waiting", sometimes until eventually I get a message that the system is down. This often starts at log-in.
On the FA Cup thread it seemed to say I had not posted and needed to resubmit, so I did and ended up posting the same thing about five times. Nice to know it's not just me being an idiot.
I've started copying to clipboard before posting so that I can try again if site fails. Generally getting very irritating. Thanks to Brix for the ongoing updates.
You're welcome RTID. When you press 'Post Quick Reply' and that 'Leave This Page?' sign comes up, press 'No' and copy what you're trying to post - just in case you lose it. Then attempt to leave the thread and return to the contents page. The 'Leave This Page?' sign will come up again. This time press 'yes'. You'll probably find your post was 'published' anyway (without duplicating).
Sooper ............ I too have been caught out, so .............. I started to 'copy' each post before 'posting it' just so I wouldn't have to suffer the frustration again. Only takes a second to highlight it and copy it as a back up.