Rpm rises & Ac tripping Engine Rattling noise

Hello, i hope everyone is fine. Actually i have Prius Gen 3. I am facing very serious issue. Firstly when i truned on my car than engine makes rattling noise for a while. Driving for few kilometres with ac, there will be a lil jerk and ac cooling stops rpm will rise up also brakes became light. If i switch off my car for 10 to 15mins. Than car backs to its normal position. I scanned it, there's an error code P0A80. Which is hybrid pack replacement. I did everything like cleaning of egr, changed catalytic converter and spark plug were also charged. But still facing the issue. I feels that issue is not based on error of hybrid battery pack replacement. If somebody got my issue than please do let me know. There's much heat in Pakistan. So cant drive it without ac.