Over the last week I've noticed that when I post a comment on a thread about half the time it is not appearing in the thread. It hasn't happened before and I would say about 40% of the posts of made in the last week have had it happen. I've been extra careful to make sure that I'm clicking 'post' and so on since I noticed it happening. It does seem to happen more if someone else posts in that thread at a similar time.
Any tips on how I can avoid this happening? It's kind of irritating to type up a reply and then have it disappear into the ether.