I too faced the same issue.But after so many days I realized that it's only happening when I'm sitting in the chair.Because volume button is pressing to the hand of the chair when my phone is in my pocket.I don't know your case but I'm sharing my exp...
S24 ultra support 45W fast charging.There must be a problem in the adaptor.Because adaptor should convert the AC into DC. But in his case it is failed to convert the AC into DC. That's why your tester lights up when you put it on your mobile phone.Do...