r/iphone16ProMaxFan

I have been facing connectivity issues with my iphone specifically 16 pro max . when i am on 5ghz wifi network (150 mbps) i get around 3-4 mbps and when i am on 2.4ghz on same wifi i get 70 mbps .This is not the case with other devices as my laptop pc or even my iphone 11 they all get around 130-150 Mbps but if i test my iphone 16 pro max it mostly never goes beyond 4 mbps . in rare case scenario for a while it goes to 150 mbps then the behaviour come backs to 4 mbps anyone know how to fix this?