We've been using our I2 with great satisfaction since 2017. After updating its firmware to V01.02.0300 in April (2019), the maximum altitude setting has been inoperative. The I2 would keep climbing above the altitude we set in the DJI Go4 app (iOS and Android) without stopping nor warning us. At least it stops climbing at 120 m.

Anyone experienced that or found a fix? Thank you!

With the transmitter in mode 2 pull the left stick towards you to lower the altitude.  This is the work around I use to control aircraft altitude.  The aircraft altitude is indicated on the bottom left hand side of the the DJI go4 app.  Using the menu meters or feet can be selected.