SPECULATION (without any facts)
Is there an introduction of a new product? Maybe with the new chip.
Are they releasing the new S7+
Are they now trying to catch up?
Are they freezing sales to avoid loss with the increased BTC value?
Just Saying
My guess is that they are trying to get all b1/2/3 out the door, then when they are caught up they will have another batch. Based on the QA\QC issues they had I will be surprised that they will be releasing a new s7+ in the short term. If I was them I would be mining with them and not selling them, at least to see if the price swings to $300.
Ufo
Just use one of the controllers.
Once I get my S7's I'll be making some longer has board cables to do just that... 1 controller, 3 S7's = 1 S7 super