volume+ button problem via OnePlus 7T

  1. S1509983486732
    Donut Dec 14, 2019

    S1509983486732 , via OnePlus 7T , Dec 14, 2019 :
    my volume + is not working.recently I had a same issue I went to one plus service center and they took for two hours and they told chip get loose and not its working fine.exactly one week happened now the issue is same.what to do this type of service.