I have enjoyed N900 for more than a year till now. But a few things are getting more and more annoying with the increasing of my PHONE(other than the computer functions) usage: - The screen keeps black with a call coming no matter what I do. I have to call people back after some embarrassing moment, this has happened a couple times already. - It responds so slow at times. Such as the screen keeps black when I want to dial extensions for a phone call. I need to wait at least 3 seconds before I can switch to other programs right after a phone call. - ... I know I cannot find a phone can be this powerful(I don't mean fast CPU, but N900 can do lots of things that other phones cannot). But if I want to switch to another phone, what would be the best solution. Please share your options.