I'm having similar problems but it's almost exclusively with flipgrid, specifically when it comes to "preparing my videos." I've recorded some video responses 5 times over trying to get them to load. I've tried different cameras, different lengths, saving then uploading, no picture, some picture, all screensharing, etc. And periodically, the flipgrid progress bar will go from 11% up to 54% down to 12 % up to 57% down to 23% and so on. I have no idea what's going on, but I'm spending most of my time trouble-shooting flipgrid.