Quoted from parsonsaj:
I had 2 (of 2 total!) that went dark. Stern provided absolutely no resistance to replacing both of them, so they must know there is a known issue with the early ones doing that. I have only received 1 of the replacement readers so far but it has worked perfectly since I got it. I would recommend filing a service ticket on any that you have that will not light up.
Quoted from bowtech:
Same here. The 2 I purchased both went dark and Stern was prompt with replacing them. Second one took longer to get and it was explained they were having led issues so it was taking a little longer but I have both now and working fine.
Did they still scan even when dark? Mine only flickers sometimes now, but is dark most of the time. It still scans ok though, both off phones and QR codes printed on paper.