Braking system not functioning

I can imagine how the malfunctioned braking system would affect the entire driving experience. The braking system could be having problems in the calipers or rotors for you to experience this as it is always the most likely cause. If not, it could be caused by the wiring associated with the brake control module. A lose connection could cause the Rivian R1T to not function properly with the braking system. I think a qualified Rivian technician should be able to detect where the problem is from. Aggressive braking is a major cause of this kinds of malfunction. 

Is there any unusual noise also when applying the brakes?