I got the same error today on 3.34. :( 

Build 3.34 was addressing a different error 

Sensor Error Radar 0:FC

Thanks aweatherall. GPLama - 0:9, maybe not   

Hopefully, I was getting 0:FC for about 3 weeks before the update. Now I'm getting 05 

Since 3.34 update from my Edge 830 (it sad completed succesfuly) i got also error 0:9. Until now, i didn't had this error.
I connected the my varia 515 to pc and surprise, it needs to update the Radar component to 3.27.

I will test it more with this update and report back, but maybe that was the problem. Un incomplet update done by gps units even if it displayed Complet!

Same here. First ride after update, and now I have "Sensor Error Radar 0:5". Not 0:FC or 0:9.

Yep me too 0:5. Blocks a third of the screen and does not go away. Tap it, disappears, and comes right back up. Seems to be working fine in the background though. Getting to be a real problem.

I take a screenshot every time this happens now.  Is there a fix for this?  It's so annoying.  My recommendation is wait for a second or two before reporting a disconnection error.  This is with a new RTL-515 and the latest Edge 1040 Solar firmware from this week.