[help] my galaxy s5 comes crazy :#

MY GALAXY JUST FREEZE THE SCREEN AND I CAN'T DO NOTHING THEN HE PUT A LOT OF COLORS LIKE WHEN AN OLD TV GET OUT SIGNAL U KNOW WHEN THE TV MAKE RARE SOUNDS LIKE SHSHAHSDUIASDJASIDJASISHHHHHHHHHH THOSE COLORS AND THEN HE RESET AND I CAN'T SEE ANYTHING MORE THAN A BLACK SCREEN I HAVE TO WAIT LIKE 5 MINS TO USE HIM AND HE RUN SLOW FOR LIKE 1 OR 2 MINS THEN HE FREEZE WHAT IM DOING EXAMPLE IM IN WHATSAPP HE FREEZE THE SCREEN AND MOVE THE PICTURES LIKE IF THAT IS A SCREENSHOT AND COMES CRAZY I NEED HELP
I HAVE A SAMSUNG GALAXY S5 SPRINT MODEL
ANDROID 6.0.1
IM FROM DOMINICAN REPUBLIC THANKS YOU.:rolleyes::rolleyes::rolleyes::rolleyes::rolle yes::rolleyes::rolleyes::rolleyes::rolleyes::cryin g::crying::crying::crying::crying::crying::crying: