Even I am quite surprised by people expecting close to ARAI range. Before the vehicle hit the roads, but after Tata had announced the ARAI range, I expected a real world range of around 220kms. For my driving style and AC usage, I get 200 kms. I am quite happy with the range for the price.

Nexon EV can definitely do 90 kms at 120 kmph is my guess. Although I haven't tried driving at 120 continuously to test the claim practically, I have driven at 80 to 100 kmph and got a range of around 200. This means a range of 180 to 160 if i am not comfortable going below 10 or 20% battery SOC. Theoretically, grossly ignoring many finer details and just going by aerodynamic drag, knowing the square law for drag, one can expect the range for 120 kmph to be 200*(85/120)^2 = 100 kms. Taking other factors into account this should be a bit higher than 100 kms is my guess.

I had the same issue once. It rectified itself in 10 minutes. Haven't had that issue again.