Trackball/​Phone Freezing! Any ideas?

Hi,
i recently got the 8900 and love it. Only problem being about a week ago the trackball has gone all funny. It will randomly freeze? the ball itself moves perfectly and doesnt get stuck but i cant scroll through icons etc on the screen. 
If i give it a gentle tap it seems to fix the problem but if i lock the phone then unlock it it seems to freeze again. Is this the trackball or the phone freezing? 
Whats the best solution to get it working?
Thanks for any help you guys/gals might have.
Adrian

A few suggestions:
-You can check and see if it's your trackball with a hardware check.  This is from Blackberry Manuals:
Performing Hardware Check on Blackberry: type T E S T on Options >> Status Screen
-Clean your trackball.  just google how-to's I'd say.  I pull out my battery and use a small amount of rubbing alcohol on a tissue, let it dry for like 15 minutes, and then it's good to start up again.
-Check if memory cleaning is enabled: Options>>Security Options>>Memory Cleaning.  One thing that might be causing the slowness is if you have it enabled.  Enabling it cleans your phone of temporary crap that eats up memory, so I like to have it enabled, but it activates when you lock your phone.
Hope this helps!

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