After initially working perfectly for a few rides, yesterday I started having issues with my RTL510 which I've only had for just over week.
Pressing the button for a second won't turn it on. However, holding it for two seconds will put it into pair mode (indicating the button is ok). Resetting the device (hold button for 8 seconds) seems to restore functionality, allowing me to pair it and use it but after I turn it off the same issue happens again.
Has anyone got any suggestion before I get it replaced?