Radar [RTL510] Disconnecting/power issue

The Radar keeps disconnecting almost immediately after connecting. It looks like it's shutting off, even with near full battery.

It acts like the power button is stuck, but doesn't appear to be. Maybe a faulty/bad switch? 

The device worked fine when I got it three years ago, but I stopped cycling for 2 years... and now it's acting up.

Any thoughts or ideas?