Weird charging issue??

Hey guys. So I’ve recently been replacing cells for my Prius that goes bad. I even replaced the bus bars / nuts recently due to corrosion. I DoorDash for work and the car seems to drive fine etc through out the whole day until I come home and go down a certain hill which requires me to brake a lot causing a spike when I’m monitoring my voltage. I’m using dr Prius to monitor. But after I make it down this hill, it automatically gets hot and starts to drain the battery after being charged to the top and it only happens at this hill. Like I said, I can drive it fine all day with no issues. When I scan with dr Prius, it’s shows p3000 and P0A80 but this is inconsistent. Why can I drive all day doordashing and this only happens at the end of my day when I hit this hill?

 

Thanks. Gonna be inspecting the ecu / wiring harness!