Hi there and welcome
Can you go to Settings, My Device, Display, and disable the screen saver under Day Dream
tell me if it then stops running please.
If you would like any additional information or assistance, please do not hesitate to let me know.
And if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.
When did the problem start?
Is Daydream still disabled?