My den superbum came with a number of leafless canes and canes that have leaves that are now yellowing and dropping off too. I'm not freaking out because of the canes that were naked when I got the plant. I assume it is part of the lifecycle of the orchid. I also have 3 new canes growing, full of leaves. I think the leafless canes are the ones that bloom. And it DOES want a rest for blooming in the spring. Halloween to Valentines Day.
That is my experience over the last 5 months with mine.
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And BTW- All of my canes cascade over the pots edge. I have it hanging. I'll post a pic if you want.