It's possible that the issue is caused by a faulty charger or USB adaptor. Examine the cable and USB adapter for evidence of damage, such as bent prongs or breaking, to be sure this isn't the problem. To avoid causing extra harm to your smartphone, avoid using damaged charging accessories.
When charging, use a wall socket or a power outlet.
It is strongly advised that you charge your iPhone using a wall outlet. Also, double-check the connections between your charging cable and your USB wall adapter. You may also try a different outlet to see whether the problem is with the one you're using now.
Keep the charging port clean.
Check for debris in the charging port of your iPhone 7 Plus and clean it out. If cleaning isn't necessary, just make sure the charging wire is securely fastened.
