Previous software updates claimed to fix various shutdown problems,
e.g., Version 3.50, "Fix potential shutdown when propagating in a cul-
de-sac across a map boundary."
http://www.gpsinformation.org/allory...htm#gpsmap60cx
This 4.5 year old post reports a problem when flying in circles (post
#4 by Neo Geo):
http://forums.groundspeak.com/GC/ind...owtopic=157147
Latest SW versions:
https://buy.garmin.com/shop/store/do...t=010-00421-00
Maybe you've found a new "feature". Assuming you're in the UK
(because roundabouts are usually called "traffic circles" in the few
USA states that have them):
http://www.garmin.com/uk/contact-product-support/