It's quite normal for them to bloom successively from the same spike for quite a while.
Mine has three spikes, and they bloom whenever they're ready to bloom. Eventually the spikes will die back, but not after putting out a number of blooms per spike (I don't know how many flowers each spike will produce before the spike dies back).
It'll produce a few leaves here and there whenever it has the energy to do so.
I fertilize mine with a weaker concentration than I use for other orchids. These guys really don't need too much fertilizer. Fertilizing once every 2 weeks is good enough.
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Philip
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