Problem Samsung A50 buttons problems


Hello, I have a Samsung A50 and I don't know what the problem is, but the buttons no longer work properly. The lock/unlock one only works to lock it. The volume ones when I want to turn the volume lower or louder don't work, but in the middle it works. To print screen with Volume down + Lock button works, to take pictures with the volume buttons works but not to unlock the phone, namely to "activate" the screen so I can swipe. Before, when I quickly press twice on the screen, the screen activates so I can swipe, now it doesn't work anymore. I didn't do any updates, nothing. Any idea? Thanks