It has happened to me also but some hiccups are to be expected on new technology like this. I'm not sure if it is more problematic at certain times of the day.

I uploaded today and I have to say the improvements are a great step in the right direction. A lot more user friendly and I didn't have to go back into my steemit post to re-edit it. If the improvements continue at this pace in a couple years Dtube will be a very competitive platform.