Friction in the joint, friction in the slipper, heat build up in the (more heavily loaded) rear diff. Lack of cooling flow round the back of the shell.
Wood floor might make a difference as the diff will be spinning up (and down) more often as the rear wheels slip. If you have lots of carpet/wood changes, the slipper may also be working hard.
D-Joint should make a difference. Or running the slipper (far) tighter.
I doubt its hot enough to cause a problem with anything, except maybe the thread lock and/or lubrication in the rear joint.
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