LocalDB providing inconsistent Insert times

I have some software that regularly hits a database to check for items to process.  Items are added to the database at semi-regular intervals.  My issue is that sometimes the inserts/updates into the database take an extraordinary time.  
To test this, I created a new program with a simple database:
public static void Setup() { try { string conString = "Data Source=(localdb)\\v11.0;Integrated Security=True"; // Open the connection using the connection string. using (SqlConnection con = new SqlConnection(conString)) { con.Open(); SqlCommand com = new SqlCommand(); com.Connection = con; com.CommandText = string.Format("Create Database Test15"); com.ExecuteNonQuery(); com.Command ...