contac gamin using their on line form and explain your issue or try this press the bottom right of the screen (user Instructions on garmin site) which does a full reset but you lose favourits, I you don't want to then contact Garmin first they may come up with something different to save your favourites.
Good luck I have problems with my 54LM stuck in a left turn loop sending me in circles in France twice very helpful if you missed something, If I didn't ignore it second time I'd still be there and dizzy. Had to do a reset then and downloaded the system again as instructed.
Bob Uk
April 2014
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix satellite navigation.