Flatpak stops during download

I have tried to install several Flatpaks with no success. Flatpak downloads maybe half of the 1st package, then it just stops and sits there. Sometimes I get an error message telling me it downloaded a partial package and it moves to the the next package where the cycle repeats itself.
Error message: Warning: While pulling runtime/org.freedesktop.Platform.GL.default/x86_64/20.08 from remote flathub: While fetching https://dl.flathub.org/repo/objects/47/c35f65a1d2e42dd66c5669de6e13fd4370f5526e90090551c54ca628be49b9.filez: [18] Transferred a partial file

Has anyone else encountered this and know how to fix it?