Charging system is not working properly
my charger disconnects suddenly,whenever i try to charge it
iPhone 6s Plus, iOS 15
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Top-ranking reply
Using a flashlight and a magnifying glass check the lightning port for debris.
Try a different genuine Apple cable
Try a different USB charging source
After that better you should arrange a phone repair iPhone Service & Repair - Apple Support
Or
Contact - Official Apple Support
Anything other than Screen or Battery may be a replacement phone and the price is in the article under "Other damage"
See also: Get your iPhone, iPad, or iPod touch ready for service - Apple Support