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Hi
That sounds like the button is starting get tired and is playing up. You could install Button Savior from Playstore, put the buttons onscreen wherever you want them and bypass the physical buttons.
Roger

Its only new man. Get it replaced. it does sound like hardware.
I think the best alternatives need root but look for a "pie" style app that doesnt need root.
Pie is where you slide your thumb from the bezel onto the screen to bring up quick controls.
It becomes second nature :thumbup: