Hi there,

I have a batch class that checks if a field "Tax ID validation status" is invalid and sends reminder to the Account Owners. My batch basically checks a checkbox and I have a  Worflow rule to trigger email alert when this checkbox is true:

global class InvalidVATReminderBatch implements Database.batchable<sObject>,Schedulable{
 public String query;
    global Database.QueryLocator start(Database.BatchableContext bc){
        return database.getQuerylocator('Select id,Tax_ID_Validation_Status__c,recordtypeId from Account');
    } 
    
   global void execute(Database.batchableContext info, List<Account> accnt){ 
   list<Account>AccList = [Select id,InvalidVATReminder__c,Tax_ID_Validation_Status__c,recordtypeId,recordtype.name from Account where Tax_ID_Validation_Status__c='Invalid'];
   list<Account>saveList = new list<Account>();
   
   if(AccList.size()>0)
   {
   for(Account Acc:AccList)
   {
     if(Acc.Tax_ID_Validation_Status__c=='Invalid')
     {
      Acc.InvalidVATReminder__c=true;
      saveList.add(Acc);
     }
   }
   if(saveList.size()>0)
   {
   try{
     update saveList ;
     }
      catch(Exception e)
     {
      e.getmessage();
     }
   }
  }
 }
  global void finish(Database.batchableContext info)
    {     
    } 
    
    global void execute(SchedulableContext sc) 
    {
      InvalidVATReminderBatch runbatch = new InvalidVATReminderBatch ();  
       ID batchprocessid = Database.executeBatch(runbatch);   
    }
  }

 I have only 20 records that meets this criteria (Invalid status), when I ran the batch it seems to be executing recursively and the same 20 emails are sent out recursively. But the same batch seems to be working well in sandbox, it was executed only once ( received all 20 emails only once). Do you have any idea why the batch was getting executed recursively in Prod?
Here's my batch schedule:
System.schedule('VAT reminder', '0 0 13 4 * ? *', new InvalidVATReminderBatch());

Any help/ ideas would be appreciated.
Thanks