I have no idea if I've just receive a defective product but I've noticed some strange goings on with my MIDI controller.
Sometimes when I plug it in, the 'boot up' light sequence never stops and I have to re-plug it a few times before it works. Then when I open my DAW, it sometimes just doesn't pick up any input so I have to close my DAW and re-plug it again (because re-plugging it while my DAW is open will cause the DAW to freeze). And talking about freezing, my DAW will also sometimes freeze for no reason and it can only be unfrozen by unplugging the controller. Then of course I have to restart my DAW, which is awkward.
It's been like that since I got it (a few months) and I'm wondering if anyone else has had similar issues.
Just some more details: It's a Novation Launchkey 49 MK2 and I'm using FL Studio 12.4.2 (but the problem also occurs with the Ableton Live 9 Trial). I've had it for around a month and I am using the original cable (the problem occurs with both USB 3.0 and USB 2.0 ports). I've updated it's firmware, and the problem occurs on both the 32 bit and 64 bit versions of my DAW.