Go to your DJI Go app and double check you have beginner/restricted mode turned off so you can fly outside the limits! Also check you've got your own max height and distance values set. Worth doing because sometimes installing a newer version of dji go seems to randomly change settings!
If you have got beginner mode restrctions turned off and you still have a problem:
Shut down the aircraft and RC, sign out of your DJI account on your tablet.
Delete the app from the tablet, reboot the tablet.
Now go back to the tablet app store and download dji go again.
Start DJI Go and, if it doesn't prompt you to sign in automatically, then go to the Me page (it's on the bottom of the Go Fly screen that shows the aircraft picture near to the skypixel/editor section) and Sign in to you dji account with your ID and password.
Now check that you have the beginner mode restrictions turned off, and that you've set your own max height and distance.
FWIW, I fly with both an
I2 and a P4 and haven't had any flight height/distance restriction issues on either aircraft since they made the change a month or two back. If you use mutliple tablets/phones, then make sure all of the dji go devices are logged in too - you don't have to log out of one to log in to another.
Hope that helps!