Slipping/ not stopping/ understeer during rain in Prius V

I have this 2013 Prius V 265k miles Prius V I started driving two week ago. Tonight was the first time during rain. The car understeered during a low speed (15 mph maybe) right run and I hit a big pot hole and and barely missed the median. There was also a noise. It sounded like it came from the brakes and sounded like hitting a pot hole (noise happened as I started to slow down and before actually hitting the pot hole). Then at a red light, the car wouldn’t stop and I had the brakes applied fully ( making crunching noises) and almost rear ended somebody. At a left turn, at precisely 16mph that “pot hole hitting” noise happened again and the car slipped a tiny bit also. Tires seem okay. Traction control? Brakes? I know the 2nd gen Prius traction control is dangerous during low traction conditions from multiple posts online...