Heat & hang problem.

Hello,
I have nokia Lumia 720, when i use mobile internet connection on my cell cell is going to hot & in first month its hang 3 time ..
Over heat problem is normal ?

I just got a macbook a few weeks back. I got the $1299 one, and then throw in 2 1-gig sticks of ram. Other than that, it's stock.
I had noticed that at various times my system seems to lag. So typically what happens is I run iTunes to import/play music or run iPhoto to import photos or use iWeb to publish some website photos, and after a while the system gets so lagged it's horrible.
If i minimize to the dock it takes like 5 seconds, and same to remaximize it. I thought that I thought it was perhaps bad ram, and was about to put it through some tests. However, it's such a pain in the butt to open that little compartment with the silver stuffing on it that i decided to hold off.
So today I was lagging while listening to music and surfing the web, and i came here and searched for LAG and VIDEO and various other stuff and saw this topic as a popular one. So after reading it, i got CoreDuoTemp. I noticed my temp was 70-72 degrees. I decided to turn the pc off, let it cool down a lot, and reboot.
I did that, turned on itunes and started to play music, turned on iweb and uploaded 10 megs of photos on 1 page, also surfed various websites, opened up mail and some other stuff. basically turning all the lights on. And looked at the temp, 38-40 degrees, everything running fast, no lag, no minimize lag, perfect.
I am currently letting the pc heat up, it's at 48 degrees. still no lag. i randomly run junk and do things and see if there's a change. I just loadeed Excel, while having itunes, iweb, iphoto and some safari up, and temp jumped from 48 to 54 degrees.
I am going to watch this over the next hour or so and see what happens. i'll post findings here.. but i am now thinking the internal temp overwhelms the onboard video and causes the lag. THe video card lacks, horribly, anyway.
matt
macbook   Mac OS X (10.4.7)  

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