smart tv external hdd problem

Hi. When connecting a samsung smart tv to a flash drive it works fine. When I use a 160gb non powered sumvision external hdd it works fine. Now the problem when I use a powered 500gb freecom external hdd it loads videos, pictures etc but then the tv powers down. Could it be to big a hdd or the tv’s usb input being electrically overloaded? I have also read that the samsung is not compatible with raid hdd’s I don’t know what the freecom’s specs are. Any help as always appreciated.