Hi Andorra I had read your old post and I was already seeing the replacement of the motherboard after 22 days of use (sigh!).
In my opinion, this does not exclude the theory of favorites ... I assume that the blockage on the logo can have various causes, as indicated by some forum members, mainly a motherboard failure. In my case it is excluded since the SX900 has started working again without assistance.
I am avoiding the use of favorites, you never know. Of course, in two years before the guarantee expires, I will play with my favorites for a full hour.
If it gets stuck I will ask for technical assistance under warranty ... maybe I will replace the used SX900 with a new one ... LOL .
One thing that came to my mind ... Before the SX900 froze I have able to delete all the favorites, so nothing was left in memory, I don't know if this may have positively affected, in my case, with the subsequent update 1.04, nothing else comes me to mind.
PS:
I remember, however, that the use of favorites happened to me involuntarily. I held down and saw that the icon was highlighted by a yellow bar. Now it is definitely not your case, but it is only to emphasize that the operating system provides this possibility and should not create problems ... However, that this (about the favorites) is only a theory and is not said to be founded.