How to fix navigation crashes for T-mobile mytouch 3G?

HI all, I am facing a problem with T-mobile mytouch 3g as MyTouch 3g operating system 2.2.1 causing navigation crashes, and slow operation.
Information:
Device: MyTouch 3G
Carrier: T-Mobile
Country / Language: USA English
OS / Browser / build number (if applicable): 2.2.1
Do I need to buy some other handset or is there any way to get out of this problem and fix it.

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