My friend, I was just reading about this here, from the dev team.

I have had similar problems - now I have started to check and reload even when it says it failed - often it really is going through! Thus your multiple transfers or double comments. Beware of just trying multiple times like we used to do.

Also, consider having a trusty backup. Many use busy.org - but I love the image uploader and so was reluctant to actually post there, also the markup is not the same as I am used to.

The link above goes to steemitstage.com, which I have been using with my Private posting key. I always comeback to steemit.com to do transfers. You will see you can switch between them by just changing the root -

steemitstage.com/@sanmi
is the same as
steemit.com/@sanmi

even with articles, replies, comments etc.

I hope this helped! - Just my experience ;p