Maybe this is a symbian issue I do not know.
I have noticed that from time to time the N91 will freeze or not open a certain application (such as the new opera browser out today) and will also start to feel hot at the back - I do not know what is going on here? Is it the fact that the hard drive is being used so much it heats up? what is going on? and is it a problem that could damage the phone or something that makes no difference?