Low heat blow drying the port is a good option ...clean the port to see if there is any debris..before all that ..turn it off and try to charge it if its charging turn it on..if its charging then sensor issue..buying a wireless charger is the best op...

Its not..on warranty..

Basically this is actually there quality issue..which is very common..it is better u take it to the service centre..rather than trying to self fix it..warranty is on right..

This is normal for almost all the premium phones..dont worry over it ..one thing u can try to pluck it out and then press it inside hard if the lock system is fine then it will fit in..otherwise u ll have to replace it ..to make the phone waterproof ...

Dont worry abt it brother..itz normal for most of the samsung fons..press and lock mechanism is used for that button..that is why it is loose