There have been that the Leica Q2 is suffering from a bug which renders certain RAW files unreadable. Iowa-based photographer, Josh Byers, outlined the problem to Petapixel:
“I was shooting an event and in the middle changed my drive mode on my Leica Q2 to ‘continuous super speed,’” Byers says. “When I went to import them, all the images not shot in this mode imported fine. All the images shot in that mode gave an error.
“I tried to import in Lightroom, Photoshop, Capture One, Adobe DNG Converter and all did the same thing. They recognized the first images but did not recognize the ones shot in this ‘continuous super speed mode.’ I’m stuck now not being able to process images from the event.”
According to reports, however, Leica is aware of this problem and is working on a firmware fix.
I haven’t experienced any problems with RAW imports (in my case to Lightroom Classic) and it seems that the problem is limited to the drive mode issue outlined by Josh Byers.