Hi friends I'm having an issue with my M02s..my phone always says USB connector connected and disconnected..so I can't keep my phone screen off because of this notification..I cleaned the charging port with contact cleaner,replaced the charging port,...

Hello friends ..i bought a samsung M02s new phone ..and i noticed an issue of the phone...the issue is while in a phone call when i want to disconnect the call the call screen is disappeared,i cant find red hang up key and other call related tools on...