TomTom one v2 problems,(has Jane died?)

I have a 5 year old One v2 and the last few updates have been
troublesome; On two occasions the memory card has been rendered
unreadable.The most recent update of the safety cameras on a working
install brought up the blank "No maps found" message with the map seen
to be present but the card showing free space+used space not equal to
card capacity, ie a corrupted file system. Put a new blank 2g Lexar card
in, removed the TomTom folder from my documents and downloaded
everything from scratch (App, map, voices). Device restarted, flashing
firmware as it booted but again no maps found. What do I do next? or is
it fubar. Note I find I can put card direct in PC and update that way
but it's a long-ish procedure