I have skype, gmail and google talk accounts enabled and also screen locked with password. Often times UI becomes so unresponsive, that I'm not able to use it at all and have to restart (sometimes by taking out battery). Today someone called and screen didn't light up for quite some time, then it lit up but didn't respond to my input until caller gave up finally.

And this happens all the time.

My mobile phone bill shrank significantly with n900 - I'm just not feeling like using this device.