for some reason, my samsung a9000 just started glitching. it would take like 2 seconds for the screen to come up when i open the phone just now for some reason. and now, i turned it off to see if it would help but it wont. i had to get the charger and plug it in to turn on. now, only the front screen lights up functional but the main screen is dead, only pitch black light shows. whats the problem and where can i get it fixed?

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