Recently bought new adapter and cable but still facing issue with fast charging

Hey everyone,

My old adapter for broken so bought a new one and after few hours noticed that the phone is connecting and disconnectijg from charging . Searched about this online and realised it is only in fast charging . Thought it was the adapter and went to and authentic service centre and they blamed the charging port . I changed my charging port from a trusted local shop and nothing happened so went to the exclusive samsung center and they figured out the issue was cable , I was a little shocked becaue it was something that didn't showed any problem before I bought the adapter , so bought the new cable and then a week later same thing started happening and changed it with the service center near me and at home it is same thing happening now again .

Everything I bought was from official samsung stores , other than charging port I installed everything is samsung original

What is actually wrong in my case ? Is it the new adapter that is destroying the cables ? Or is it the charging port ? Or is it the charging cable I got again faulty coincidently ?