rebooting + charging problem

hey guys thnx for dropping by hope some can help me

my phone dropped and the whole sound system stopped working , took it to a tech he told me that the Sound IC is broken , replaced it and the sound works . afterwards the phone kept rebooting every 1 minute. took it back to the tech and he tried multiple solutions to stop the rebooting and it didn't work. it fixes for like 1-2 days then it starts rebooting again . once more it was dropped later when I taking it back to the tech and the problem was the buttom part of the phone was broken so he fixed it. then when I took it back the phone rebooted and the battery stuck on 3% and wont rise and also keeps rebooting . I would really appereciate it if someone can tell me something to forward it to the tech so finish it up once and for all

thank you <3