I blur out at random times when driving?

Hello,

So I am regularly driving with my driving instructor and I (him as well) noticed that sometimes I just blur out, like my brain stops processing the information it receives.

I also had this when I did the official exam for my driving license, I basically started driving on a junction even though a car was coming our way. (I did see the car)

It's really annoying and I don't know how to fix.

Ps: I don't use any drugs