TTN5 Map crashes nr St Austell.

I can't remember if i've ever used my ttn5 on pda to take me past St Austell (Cornwall) but i've just been planning (trying to plan) a route and there seems to be 3 straight A roads from St Austell to the Norh coast which are causing it to go into meltdown.

I've uninstalled it all and reinstalled from the original card, but the problem is still there.

Anyone got the same problem?

Anyone have any idea how to correct it?

According to tomtom the country stops just past Bodmin, wierd.