My wife was driving yesterday and TACC suddenly disabled. Just before it disabled the map stopped updating properly - half ot the screen was block tiles, not detail. Map stayed 'frozen' for a couple of miles then refreshed properly - exactly the same time as TACC came back. I cannot see why these would be correlated, but timing was remarkable if not related. Wondering if there's something funky going with the computer (not the latest 8.0 firmware, but still it is on 8.0-something). AP and TACC seem to disable at the strangest times, on roads/locations they have been active before.