Dear Samsung Member,
Greetings from Samsung Customer Support!
Please perform the below mentioned steps to resolve the issue:
1. Check device in Safe Mode.
a. Press and hold the Power key, when Power off icon appears.
b. Press and hold the power off icon.
To exit safe mode just restart your device.
For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).
Thank you for writing to Samsung.
Samsung Customer Support
You're not alone mine started having that green tint too after June 1 security patch. It's not hardware coz it still shows solid blacks, but when it's dark gray it turns greenish almost murky even. Never dropped never over heated.