Why are tips of rubber plant 9ft tall going brown?

Why are tips of rubber plant 9ft tall going brown and why wont old leaves grow back?

Old leaves will grow back. Don't cut the branches or take off the old leaves. Not too much water.

Sometimes cold weather does that to them. At the very least you will lose the softest and topmost branches, but let them naturally die and naturally shed the leaves, or you will kill the tree otherwise.