Oh, mine have been bickering more lately too! The
heat? I don't know...
I try to talk to them on their level about whatever the issue is
(like screaming at the top of your lungs does not get you want you
want...) But I seem to have to repeat myself every day.
Several times a day.
And, yes, I've heard they should start working some problems out
themselves, but here it tends to fall into a physical fight within
a minute or two... Tempting as it is sometimes, I just can't
let them beat on each other.