Thanks to all for their responses...Here's Garmin's..in case you find yourself in my predicament..
Hello Don,
I apologize for the issues that you are having with your Edge 500/510/810. There may be some form of file corruption on the device that is causing these issues that you are having with your Edge 500/510/810. I'd like to connect the device to a computer to remove some folders and files and to also ensure that you have the latest software version installed. Do NOT delete unknown files; deleting wrong files from your mass storage device can cause adverse performance affects.
Folders that can be safely cleared: (Note that your device may not have all of these folders)
Activities
Courses
Newfiles
RemoteSW
Segment
Workouts
Gupdate.gcd
Gupdate.rgn
Gmaptz.img
.err .bak .tmp files
PC:
Connect the Garmin device to the computer
Click Start menu*
Click File Explorer, Computer or My Computer
Double-click Garmin device drive
Click This PC (Windows 10 only)
Double-Click on the Garmin drive
Open the Garmin folder
Open the folder you wish to clear
Select files to be deleted (to select all files, press CTRL+A on the keyboard)
Press the Delete key on the keyboard
If prompted, click Yes to confirm the deletion
Click the Back button to return to the previous folder
Complete steps 7 through 12 for each folder you wish to clear
Click the Back button to return to the drive list
Right-click on Garmin drive
Click Eject
Unplug device from computer
*For Windows 8, press the Windows key + X and choose File Explorer
Once you have removed these files you’ll need to connect to your computer and sync your device with Garmin Express to ensure that the software is up to date.
Mac:
Connect the Garmin device to the computer
Open Finder
Click Go in the menu bar at the top of the screen
Click Computer
Double-click Garmin drive
Open the Garmin folder
Open the folder you wish to clear
Select files to be deleted (to select all files, press Command +A on the keyboard)
Drag the selected files to the trash
Click the Back button to the return to the previous folder
Repeat steps 7 through 10 for each folder
Click the Back button to return to the drive list
Right-click the Trash on the Dock
Click Empty Trash
Click Empty Trash to confirm
Right-click the Garmin drive
Click Eject “Garmin”
Unplug device from computer
Once you have removed these files you’ll need to connect to your computer and sync your device with Garmin Express to ensure that the software is up to date.
Should any issues persist, please reply to this email or call Customer Support at 1-800-800-1020 (available Monday through Thursday 8:00am to 6:00pm CST, Friday 8:00am to 5:00pm CST) for further assistance.
Angel
Product Support - Fitness Team
Garmin International
http://support.garmin.com
I've done as requested and although I had very little of those files in the folders, I must had at least one corrupted one as it seems fine now, but we'll see in the upcoming weeks