Problem with Speed Camera POIs on my SP2720

[tophat]

Has anyone else seen this:
My StreetPilot 2720 is alerting me to speed cameras at 6mph below the limit.
For example, a 30mph camera gives an alert if I am going at 24mph or above; a 50mph camera at 44mph and a 70mph camera at 64mph.

This has only happened since I updated the unit's software from v4.20 to v4.40, before that it only alerted when I was travelling above the camera's limit.

I have since updated the software to v4.50 and the problem persists.
I have also downloaded the latest POIs (from this site), still to no avail.

Anyone any ideas?

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