Update- 29/11/18 , 1 month of use. Had to change to 1 star. The remote home button no longer works, neither does the voice search. Changed batteries with new, also rebooted remote, also turned off cec. Rebooted stick. You name it i did it. So I bought another fire stick 4k, which works so far. 1 star is given Since I had to buy another stick.
1/11/18 This is my 3rd fire tv unit. I hade 1st gen fire box, and a fire stick basic. 1st gen died, fire stick basic was really slow so thats why i bought the 4k stick. The install of the 4k stick wasnt as smooth as the others. It was stuck in a loop. Then when i did get it to work, it would later get stuck in the boot loop again. I eventually found online that it was the remote. If you take out the batteries, and put them back in again, this will fix the looping. Hope that helps someone.