SQLite Db is not responding (not readable) after a consecutive set of db calls

I'm developing using angularjs and jQuery where in i do operations on SQLite db.

I'm doing db calls on where in db is responding properly but after usage of app, db operations are not responded even reading db..

Also i have a problem on memory leakage will it effect db and its operations ??

It would be thankful if there is any solution for this problem