Well they could be sick, is there anyway to take them to a good vet? could also be they are just getting older too and they have different interests. But if they are off their feed and laying around alot except for the hot weather maybe they have a sinus infection, what about their breathing is is labored are they breathing with their bills open. any eye discharge?They seem to run away and they are not swimming as much and that are very down and not as playful and they