If I use multiple time this component in the same page and at different module position, happens this:
The highest slideshow in the module positions works perfectly, the following ones loose the resolution of the image after few seconds.
I am afraid this problem is not related to sigplus in any way. Instead, it appears that some third-party extension is interfering with sigplus, and causes it to malfunction. If I were you, I would take a look at my smart image loader extension or my template if it ships with a built-in smart loader. Unfortunately, sigplus cannot be prepared to counteract aggressive extensions that either intentionally or unintentionally refuse to be nice and play by the rules.