I had the same problem on a Galaxy S with TomTom GO 1.8, however, switching back to TomTom GO 1.4 fixed the issue. In my case I think it was the lack of memory available on the phone which is limited to 512 MB ram. I can only suggest that you check the available memory as I have heard of no problems from friends running phone with 1.5 gig memory and above.
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