another one here that has the same problem since the beginning. The problem basically is that HOS only has about 200 MB of free RAM after booting, and this is too few. Then, when you open some big apps or games, the system closes sense to make space for tha app, then when you return to the home screen, sense reloads itself..... It is normal, it is not a malfunction, but I guess they should solve it, it is quite anoying to be waiting several seconds for the sense to reload until you can go on using the phone, at least it is anoying in this so high class phone....
I think there is some tweak or mod over there that modifies the behavior of android so it won´t close sense and it won´t reload anymore, but you have to be root to do it.