iPhone 11 Pro and Pro Max Overheating issue in Games and Multitasking

Having problems with my iPhone 11 Pro from last 1-2 months after iOS14 iOS 14 update has make this problem even worse my battery health has been low very fast and random screen dimming faster than Xs and Xs max. Talked with Apple support on Twitter and in Chat and Technical support team gave me silly reason like clear RAM and background Apps which we should as it helps to open apps faster during next use. I would like to get my issue fixed as i still have the warranty and i know apple is not reaching me as my warranty is about to expire. The reason is new iPhone 12 series are here. Not buying iPhone anymore. Pro is just a scam