Seek Help. The status won't change for a long time in the learning process

[kavanagh-cw]

@masato-ka Thank you for your significant work that inspire me in RL
After I installed it, I face some troubles during training the car.
When I start the learning process via using the gamepad, the car works fine, also the status get change in the Validation box.
However, after few episodes are captured, the status doesn't change anymore.
I have tried both user_interface.ipynb and user_interface_without_gamepad.ipynb, but I faced the same problem.
The total episodes which I captured manually don't more than 50 for each trial.

Besides, I also tried to use jetracer-auto to train the model
After captured around 300 times, the status also didn't change anymore
The picture below is the screenshot

I am using Waveshare Jetracer
Could you give me some advice? Thank you very much