your redmi k40s mobile charging port refusing to sync when you plug it in, frequent use of the charging port can cause problems. it’s fairly easy to dislodge internal components that make the redmi k40s mobile charging port work properly. condensation can into the port and seep cause rust and damage to your redmi k40s mobile. we can help you with redmi k40s mobile repairs. you should try a few simple troubleshooting tasks to be sure that professional redmi k40s mobile repair is what you need.