Copter going into RTL Mode without reason

Hello all, I am having an issue where my quadcopter is switching to RTL after few minutes in the flight and at a very short distance. I can’t find what is wrong. Attached are the logs. Can someone please help?
The logs are here:

You are constantly getting radio failsafes

It’s not the throttle failsafe value, and it doesnt look like power supply problem.
I think whenever RSSI is going over about 128 it triggers the failsafe. You might have to check your receiver range and antenna placement.

Thanks Shawn for your reply. Do you know what is the correct RSSI I should be getting?