Rear hub movement

Hi,
After 100km ride I have noticed some weird movement in my rear Novatec hub.
It is causing rim to move up and down. The cassette doesn't move like that.
Is it some serious stuff? Can it be fixed without replacing hub?
Here is my video:
bit.ly/2HOF1Og

Similar problem:
bit.ly/2TRSZpW
Greetings