Help please :(

I have a samsung galaxy A5 (2017), I've been having an issue where i can only hold my touch for about three seconds. I can do stuff but when I try to send voice texts and play games that requires continuous touch that's when it happens. Can't hold on for more than three seconds, it releases itself even tho I'm still touching the screen. Can anyone tell me what's happening? It would mean alot to me thank you so much I really appreciate it!

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