FYI, Zumo 660 firmware Update V4.2 released

Changes made from version 4.10 to 4.20:
Software update restores Bluetooth settings to default values. Bluetooth devices must be paired with the zumo again.
Added the ability to reset the odometer map field.
Increased Bluetooth volume when connected over A2DP.
Improvements to screen brightness.
Fixed crashes that occur when importing long routes from MapSource.
Other general software improvements.
Click Here for region file.

Download and install went fine. Performed master reset holding bottom right of screen on startup then copied current.gpx back to Garmin drive.

Noticed the first time I left the house that the Alert banner was on with no alert words and heard the bong-bong for a generic alert. It never went off until I turned the GPS off a second time. Over the next few days discovered that all of my alerts were just putting a blank alert banner on the screen and giving me the bong-bong.

I removed all alerts while connect to the PC.
Ran the GPS for a while without any alerts.
Then reloaded all of my alerts and they appear fine now.

All of my POI alerts are still very erratic. The same alert will work one time and not the next since installing the new software. I'm having the same problem with both TourGuide and along the route alerts.

The new firmware also re-introduced the shutoff problems I had before the last map update. When doing a search using "Where To? / Points of Interest" 50% of the time the GPS immediately shuts off.

I will probably re-install my previous version backup this weekend.

thanks for the info