N900 touch sceen problem

Hi guys,
Ive recently started having problems with my N900 which Ive had since January.
Over the last few days the touch screen has been acting strangely sporadically. The screen either stops registering touch entirely or acts as though it is being pressed when it is not. This makes using the screen nearly impossible. The best way to get an idea of my problem is to try and change the desktop screen while touching the screen in another area.
I read around to find the common causes for this and have removed the screen protector and have uninstalled all the apps that I had recently installed but this has not made any difference.
The strange thing is that this problem comes and goes. At the moment the screen is fine but randomally and sometimes for hours at a time I cannot use my phone.
Does anyone have any advice on how I can fix this issue?
Many thanks

Hi guys
Need your advice...anyone!!
My Nokia N900 touch screen just stopped working. One minute it was working....next minute.....no response. It simply stayed lit up, but it would not scroll or work when touched.
I switched it off, took the battery out for a minute or so and turned it on again. The usual start-up screen came up but I could not change the default settings (Language, Region, Time and Date). It will not respond to touch and there is no other way I know of that you can set these. Consequently it is now stuck on the start-up screen and will not allow me to save any settings. I have done this several times, even left it off for an hour or so. It boots up to the default settings and gets stuck there. I can't even us it as a phone. I rang the number a few times from another phone. It registers as a working phone, but does not ring and it cannot be answered. When I plug it in via USB on my laptop, it starts charging the battery but it does not register as a device that I can use. I just stays fixed on the same screen.
Can anyone out there help?
atleast tellme is it software problem or hardware problem.
pls mail me ur replys 
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