Roku setup

[MaxS7]

I just bought a Roku express and either the controller doesn’t work or the screen freezes. Then every 30 seconds the thing restarts and sometimes I can control it sometimes I can’t. 
I have put new batteries in. Restarted the device. 

[renojim]

How are you powering it?  If you're using the TV's USB port, try using a USB power adapter/charger from a phone or tablet plugged into the wall.

[MaxS7]

I have moved it from the tv usb to a power outlet. But still the same issue 

[renojim]

Look at the fine print on the USB power adapter and make sure it says something like, "Output:  5V 1A".  Anything greater than 1A (1 Amp or 1000mA) is all right, but less is not.  If that checks out, about all that's left is a factory reset and if it still doesn't work return it.  TV USB ports can often only supply 500mA, so that's why plugging it into the wall is recommended.

How do I factory reset my Roku® streaming device? | Official Roku Support

Step by step instructions for returns and warranty replacements | Official Roku Support