This is not an issue I am aware of. I have a testing OS 2.1 and I have just flashed firmware 2.1.2 to it, tested for 5 minutes on different devices (laptops, phone app, pads) and I didn’t find any issue. Just to make sure: after upgrading to firmware 2.1.2, did you change any settings/options, or did import? If so, what settings/options did you change?