Other Screen darkening ( happens only in some places ! )

[PoBoy]

Samsung GS3. Screen started darkening here in Mumbai. Owner spent 3 monhs in Sydney, AU and then 3 months in Dubai. The screen worked prefectly there. Owner returned to Mumbai, within a few days screen has darkened again.
Any solution ?

Screen replacement cost is 7 K. Not worth it.

 

[nRiTeCh]

Are you the owner or owner is somebody else?
What happens when brightness value is set to full? Also disable auto-adjust brightness setting.

 

[PoBoy]

Cuz's wife.
The phone worked perfectly in Sydney & Dubai so I doubt it's settings-related.

 

[nRiTeCh]

Pretty weird. Phone doesn't like mumbai climate.