A Typical Nseries Slow Response Issue (Esp. To Nok...

I had this both on N73 & N93. I did not have this issue on my N95 yet, but I recently updated firmware to V30. May be the firmware installation is relatively new, the same issue has not happened yet on N95.
When you first start using the Nseries phone, it works relatively fast. Menus are fine. It is not that fast, I know, but it is fine.
But after couple months of normal using, I am not talking about installing so many applications, or having the memory card filled up full, just a normal use, the phone's operating system starts to slow down. This has always been an issue with Nseries.
What happens is that, in time, there is a slow menu response, menu lag, and esp. the phone lags when it is waking up from standby screen (screen saver).
This is also really weird: The phone goes in to the standby mode, the display is turned off, the bar showing the date and time appears, and the phone goes to sleep. (You can choose the time from setting menu). Now press a button to do something let's say, enter in to contacts, the phone phone can't wake up fast. It lags several seconds before it enters to, let's say, "Contacts."
Once you start using the phone, it is fast again, but it is that very moment, when it is first waking up from standby, turning on screen and all, adjusting the brightness, when you try to do someting at that very moment, it acts slower, kind of, well, it hangs... It does not do this when the phone's OS is fresh, it starts to do this in time.
Anyone had an idea why this may be happening? There must be a reason for this.
The easiest solution for this is to "Reset" the phone. And your phone goes back to it's brand new stage and yes, the phone works fine for a couple of weeks or months but then, same thing happenes again. And it is really pain it the ***** to reset the phone, re-install everything. It is really time consuming.
I guess we will have to live with that. I have never found a solid answer or a solution to this other than "resetting" or "updating" the phone's firmware. But may be I was thinking, may be someone knows what to do to trick the phone and avoid this really annoying "slow responses", "lags", or "temporary hangs".
Thanks In Advance.

This is what I do:
1) When I get a new phone I boot it up. Let it finish the initial boot. Then Open Music Player, Video player, Photos, Video Center, Gallery, Camera,e tc. and check that everything seems fine.
2) I make a Back-up using content copier or now OVI.
3) I install only applications that I've tested and research that are not causing problems to the phone. If I'm trying some "unknown" application I'm always careful to make a recovery backup before I install so I can return.
4) Back up frequently Contacts, Pictures, Videos and other important stuff.
5) If the phone becomes unstable, memory fills up or something weird, then I reset and restore either the last known good backup point or the intial "new" backup I did in point 2)
In my experience the best way to keep the phone working properly is NOT to load a bunch of applications of unknown quality or origin. SPECIALLY keep away from unsigned applications. The fact that they're unsigned means that there have been NO testing done by any official source and there are NO guarantees that this will not break or damage your phone!.
640K Should be enough for everybody
El_Loco Nokia Video Blog

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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          

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