False pregnancies?

[lobsterman]

Should I be scared about "false pregnancies" on one of my vandas?
I have a monster vanda, apx 8'-10' tall from top of upper keiki to lowest root tips. The "mother" has had a couple of times in the last year where she will produce a bloom, then start a new spike that will die off before completion. Then a few months later, a new healthy bloom. When that one is finished, a few months later another new spike grows to only 3-4 inches, just when you can start seeing "bumps" on the spike and then die.

Any ideas? Is this normal, or do I need to be taking evasive action?