Failed to grab locks

The "Failed to grab locks for" message indicates a technical inability to make the state modification in the account at the time of the API call. This error generally indicates that there was simultaneous activity in the account preventing your app from making the state-modifying call (e.g., adding, copying, or removing files) it is attempting. The simultaneous activity could be coming from your app itself, or elsewhere, e.g., from the user's desktop client. The best practice when receiving this is to just retry the request, respecting the `Retry-After header if given, or after a small delay possibly with an exponential back-off. If the activity is coming from your own app, you should avoid making multiple state-modifying calls in the same account at the same time.

I don't believe API v2 would improve this, as this is how the Dropbox backend itself works.