i'm afraid you're going to have to describe your problems better if anyone's going to be able to offer help - you wouldn't text a mechanic friend simply saying "my car dont drive right" and expect a solution.

have you had these problems since you got the phone?
have you enabled / installed apps from devel repository?
installed anything just prior to a problem starting?
dropped your phone, got it wet etc?
lists problems/symptoms one at a time, what you did, what's expected behaviour, and what your n900 actually does, with as much detail as you can provide.

many many problems have been solved already and a quick use of power search in the top corner is highly reccomended, if you ask someone to fix a problem which has been discussed 100 different times simply because you didn't search yourself on here you'll receive short thrift from many users.