I have exact the issue, and I dont have an external disk.
The issue just poped up suddently.
Dont know if the new update is the culprit or not, because there was the issue 2 years ago:
https://www.youtube.com/watch?v=aATQ-9PziGQ
I hope Nintendo give a shot for this and tell us why!
By now, did you guys find some solution?