When I was running Deepin I had all kinds of troubles.
I'm not running it anymore and the new DE that I installed I didn't much like tho it solved the problem.
Deepin is based on Debian Unstable and the DE is based on QT-5 toolkit.
Installing another DE may help. It worked for me.
Have you updated Deepin since your fresh installation?
IF NOT you might want to drop to a root prompt shell and do that first.
Code:
sudo apt-get update
-::-If that doesn't work try installing another DE. Mate works very nicely.-::-
https://wiki.debian.org/Mate