I got the same issue and it was because of a software update to ANT+ agent being not compatible with the 405.
here is what I got from Garmin Support.
This solved my problem:
There is currently an issue that has been identified with the latest
version of the ANT agent where it will not transfer data to the computer
from a 405cx. To resolve this please follow these steps
1. If the device has paired it will need to be removed. Right Click on
the ANT agent, select Device Settings then click Remove Device.
2. Right Click the ANT agent and select Exit to close the ANT agent
3. Go to the Control Panel, select Add / Remove Programs and uninstall
the ANT agent.
4. Reboot the computer
5. Download the previous version of the ANT agent from
http://www8.garmin.com/software/GarminANTAgent_221.exeRun this file once it has downloaded
7. Turn on the pairing on the watch ? to do this go to Menu > Settings
> ANT+ > Computer > Pairing (on).
8. Enable pairing on the computer - right click on the ANT agent icon
and select Pair With New Devices > Enabled (this may already be enabled)
The Forerunner and computer should now pair, please be aware that it can
take several minutes for the computer to find the watch.
How long should it take to "automatically start downloading" - with or without force send enabled?
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