Hey guys

Got an iPhone 11 that was brought in for the volume buttons working on and off. I assumed this was as a result of a drop/shock that had pushed the buttons into the housing but this was not the case.

If you just tap the buttons up and down the volume for the most part changes as you would expect other than a few times it'll make the animation of changing the volume, but the actual slider will not move up/down and the actual volume won't either. The volume bar then disappears, then about 3-4 seconds later the audio goes to the volume you would have selected and the sound bar reappears. This problem also happens when you hold down the volume buttons to either go to minimum/maximum volume.

Board level/hardware? I have tried factory reset and a full anti recovery flash to iOS 14 on 3utools.

Any insight/previous experience with this issue would be greatly appreciated.