Last active last year
If it shows as downloading really fast like that, the files source may be the problem. If a file is not created correctly, or not uploaded correctly, it can cause that. Which wouldn't be on your end, or the tablets. Also, have you made sure the tablet (and your apps) are fully updated? And lastly, it is possible part of your problem is due to an app on the device that is causing problems. You might want to try running in "Safe Mode" and see if you can get the downloads to work that way. If they do, and you can view them, then you need to figure out what app is the culprit.
To get into "Safe Mode" please do the following.
Regards, Toshiba support
Drop me a line if I can do anything else for you.