Google sheets API is not retrieving correct values - ruby

Question

I'm using Google sheets API (v4) in a ruby script to retrieve the values of a particular columns and this script is running using cron job on a EC2 Linux machine. The script is running fine and fetching the values from the sheet specified. If the existing columns was updated with new values, sometimes the script is retrieved the older values while invoking through cron and sometimes the updated values. But when I run this script standalone, it is always picking up the latest values.
Can someone help in debugging this? Is it an issue with my code or with the cron invocation
Below is the piece of code which retrieves Google sheet values
​def authorize
client_id = Google::Auth::ClientId.from_file CREDENTIALS_PATH
token_store = Google::Auth::Stores::FileTokenStore.new file: TOKEN_PATH
authorizer = Google::Auth::UserAuthorizer.new client_id, SCOPE, token_store
user_id = "default"
credentials = authorizer.get_credentials user_id
if credentials.nil?
url = authorizer.get_authorization_url base_url: OOB_URI
puts "Open the following URL in the browser and enter the " \
"resulting code in the console after authorization:\n" + url
code = gets
credentials = authorizer.get_and_store_credentials_from_code(
user_id: user_id, code: code, base_url: OOB_URI
)
end
credentials
end
def get_budget_spreadsheet_data
# Initialize the API
service = Google::Apis::SheetsV4::SheetsService.new
service.client_options.application_name = APPLICATION_NAME
service.authorization = authorize
spreadsheet_id = "XXXXXX"
range = "Sheet1!A2:Z"
begin
response = service.get_spreadsheet_values spreadsheet_id, range
rescue Exception => e
puts "Error occured while retrieving budget values. #{e.message}"
exit
end
if response.values.empty?
puts "No data found."
exit
end
puts response
end