RTL510 seems to crash when faced with high traffic density.
Having the same problem. I have a RLT 510 linked to a Edge 820. It worked fine for several months but lately the connection keeps breaking. The 510 is fully charged but the blue flashing light stops and my Edge says the radar is disconnected. The radar icon flashes red on my edge. If I turn the 510 back on it reconnects but eventually loses connection. It apprears that the RTL 510 is shutting down for no reason.
I too recently started getting these disconnects after many months of flawless performance. I suspected the 820 firmware so I rolled back to v10.00 and the disconnects are gone. I think Garmin have screwed this with recent firmware updates to their head units.
Ditto here. I just got a Edge 530, and the RTL510, and love them both... except... the RTL510 shuts off... and once the Edge 530 just lost connection, but the light stayed on. On a 5 hour ride in light traffic it happened twice... in city with more traffic in just an hour it happened 3 times and then I just gave up turning it back on.
I had the same problem with the Varia disconnected repeatedly from my 520 & FR935. I attributed it to my 520, since it constantly dropped connections from every ANT+ sensor that I have.
But while on a 110-mile rode last month, my Varia battery died because I didn't recharge it. The light came back on briefly, then shut off. When I got home, it was completely depleted. I recharged it, which took a lot longer than usual, something like twelve or more hours. Since then, it has not disconnected at all. Worked with my 520 & 935 at the same time, and now works fine with my 530, 935 or both.