My partner and I had one Varia RTL510 that we shared for approximately one month. It was sync'ed to each of our computers (mine, a Garmin 520 Edge; his is an older 510 I believe). We were testing the Varia, liked it, and so we bought a second unit so we could each have our own.
Despite hard reset-ing the Varia and removing the bluetooth connection from each of our computers, there seems to be a ghost Varia connection that's really annoying. Basically when I'm with my spouse, my Varia works. If he pulls too far ahead or splits off on his commute, my Varia (or maybe it's my garmin) will lose the connection ("radar disconnected") for the rest of the ride or until I turn my computer on and off. HOWEVER, if I'm by myself, my Varia & my computer work fine the whole time. This error ONLY happens when I start my ride with my spouse, we each have our own Varias and own computers, and he pulls far enough away that something loses the connection ... but again, when I'm by myself, my varia and my 520 work TOTALLY FINE together.
This would be less of an issue of the Varia continued to illuminate after the radar is disconnected, but it doesn't - the red light turns off, so I have no rear light.
Any tips? We've tried resetting both Varias and wiping the connections from both the 520 and 510, and this problem still occurs.