I've been trying to upload two mp4 videos and both have frozen half-way in the upload.  I have uploaded similar size videos at least 10 times in the past.  I even tried to upload to a test page a video that previously uploaded and it, too, froze half-way through the upload.  Everything else about my system is the same.

I was told to minimize my files.  I did minimize the video that previously uploaded, and it still would not upload again to my test page.

Techs have been unhelpful.  Any ideas?