My organization hired a consultant to do some customizations. One of the things they did was to write a trigger that runs after a gift is created or updated and to update fields on the associated contact's record. But, it is failing when I try to update more than 10ish records at a time, either via the data loader or via bulk update from lists. 

Can someone either: 

1 - Look at this code and tell me how I can update it so it can handle bulk updates, or 

2 - Tell me how to temporarily disable this trigger so I can update the records? 

Any help would be grately appreciated!!!!!

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75 trigger updateGiftInformation on Opportunity (after update, after insert) {
  
  for(Opportunity o : Trigger.new){
         
         Decimal accountLargestAmount = 0.0;
         Decimal contactLargestAmount = 0.0;
         Integer accountCount = 0;
         Integer contactCount = 0;
         
         Account accountToUpdate = [select Id, Largest_Gift_Date__c, Last_Gift_Given__c, Largest_Gift_Given__c 
                         from Account
                         where Id = :o.AccountId];
      
      Contact contactToUpdate = [select Id, Largest_Gift_Date__c, Largest_Gift_Given__c, Last_Gift_Date__c,
                         Last_Gift_Given__c
                     from Contact
                     where Id = :o.Contact__c];    
      
      Opportunity[] contactOpps = [select CloseDate, Amount 
                           from Opportunity
                            where Contact__c = :o.Contact__c and
                            StageName = 'Posted'
                            order by CloseDate desc];
      
        
      if(o.AccountId != '0018000000U9G5W' || o.AccountId !=null){
         
                  
           Opportunity[] opps = [select CloseDate, Amount 
                        from Opportunity
                         where AccountId = :o.AccountId and
                         StageName = 'Posted'
                         order by CloseDate desc];
           
           for(Opportunity currOpp : opps){
             
             Decimal tempCurrency = currOpp.Amount;
             
             if(tempCurrency > accountLargestAmount){
               accountToUpdate.Largest_Gift_Date__c = currOpp.CloseDate;
               accountLargestAmount = tempCurrency;
             }
             
             if(accountCount == 0){
               accountToUpdate.Last_Gift_Given__c = currOpp.Amount;
               accountCount++;
             }             
               
           }
      }
         
         update accountToUpdate;
         
         for(Opportunity currOpp : contactOpps){
           
           Decimal tempCurrency = currOpp.Amount;
           
           if(tempCurrency > contactLargestAmount){
             contactToUpdate.Largest_Gift_Date__c = currOpp.CloseDate;
             contactToUpdate.Largest_Gift_Given__c = tempCurrency;
             contactLargestAmount = tempCurrency;
           }
           
           if(contactCount == 0){
             contactToUpdate.Last_Gift_Given__c = currOpp.Amount;
             contactToUpdate.Last_Gift_Date__c = currOpp.CloseDate;
             contactCount++;
           }
             
           
         }
         
         update contactToUpdate;
  }
}