Great to hear!
That’s a known issue, and there’s a discussion about it here. It may be fixed in the beta ArduSub software (4.1), but I’m not certain.
Hmm, which QGroundControl version are you using?
The current recommended version is 4.1.7 which fixed some recording issues.
We’re also pretty close to shifting over to 4.2 - just a few more changes to sort out before we make a new release that starts being the recommended version. You can try out 4.2.1 as is if you want, but likely our next recommended version will be 4.2.2 (which hasn’t been released yet)