Looking at Varia alternatives after my recent experiences. My oriiginal Varia RTL515 started randomly disconnecting just short of two years of ownership. Then it started to miss vehicles just 10 feet behind me. And then the button got stuck, rendering it inoperable. I replaced it with a brand new unit on sale this May and the new one is also now randomly disconnecting. I have no means of updating the device firmware because Garmin express won’t detect the device when connected via a USB-C hub (my only option to connect to an M1 MacBook). Looks like I’ll be returning the new radar and trashing the old one. Buyer beware.