Thanks for the great question 
Three elements that you need to take into account:
(1) Coin prices volatility
(2) Coin difficulty (even higher) volatility
(3) Switching time between coins

While trying to provide you with the best profits we want to avoid rapid switching between coins that fluctuate aggressively in their attractiveness..

So the dynamic algo of WinMiner takes into account the expected switch time while looking for stability in the attractiveness of a certain coin over the others, before attempting to switch.

Its interesting to see in the feedback we receive that different users have very different taste when it comes to switching - some want it no more frequent than once a day while others want to rapidly switch, the moment an opportunity unveils. We aim for the golden path that maximizes profits for everyone 

Perhaps we should be adding some manual customizing capabilities to the switching algo so every user could tailor it to his/her taste - what do you say?