There are a couple of posts about this problem but no definitive answers. OSMO has started showing "invalid sd card" warning. It has happened a few times lately. Sometimes shutting down the OSMO and also closing the app and rebooting clears the issue, sometimes not. The annoying thing is it will not let you continue to record or even format the card. Weird thing today, I shut down the app and turned off my phone, pressed record and it started recording! even though I couldn't see what I was recording the camera and card worked fine.Anyone with any ideas? It can't be the card type as I have recorded on the same card many times before with no issues.