I am no longer getting the database locked error but I did get this one now. Since you said you were having problems reproducing the error causing the locking maybe this log from Crashlytics will help.
Hi Alan,
Thanks for reporting this. Hopefully you are not seeing this often. It's definitely a bug, but doesn't seem to appear often. I've included a fix in tagged release 1.2.1
I am no longer getting the database locked error but I did get this one now. Since you said you were having problems reproducing the error causing the locking maybe this log from Crashlytics will help.
http://crashes.to/s/1ffc16a50c4