Kody Firestick issues…

Alright so we have kodi 16.1 on a firestick we updated it to 17 and 17.1 when we launch kodi it loads but in a few seconds on the screen for some reason it starts having black lines go threw it until the tv goes black for a second then repeats until we turn off the firestick even if we click the home button I know its not the firestick its the tv because we tried it on a different tv and it works fine our tv is a LG tv Kodi 16.1 works fine on it but we’d like to update any help would be appreciated.