diff --git a/app/models/user/updates_ticket_organization.rb b/app/models/user/updates_ticket_organization.rb
index bd7a149cc..9e2b7bb7c 100644
--- a/app/models/user/updates_ticket_organization.rb
+++ b/app/models/user/updates_ticket_organization.rb
@@ -19,9 +19,11 @@ module User::UpdatesTicketOrganization
     # update last 100 tickets of user
     tickets = Ticket.where(customer_id: id).limit(100)
     tickets.each do |ticket|
-      if ticket.organization_id != organization_id
+      next if ticket.organization_id == organization_id
+
+      Transaction.execute(disable_notification: true, reset_user_id: true) do
         ticket.organization_id = organization_id
-        ticket.save
+        ticket.save!
       end
     end
   end
diff --git a/spec/models/ticket_spec.rb b/spec/models/ticket_spec.rb
index 16b195f35..eedd77423 100644
--- a/spec/models/ticket_spec.rb
+++ b/spec/models/ticket_spec.rb
@@ -1487,43 +1487,6 @@ RSpec.describe Ticket, type: :model do
     end
   end
 
-  describe 'Associations:' do
-    describe '#organization' do
-      subject(:ticket) { build(:ticket, customer: customer, organization: nil) }
-
-      let(:customer) { create(:customer, :with_org) }
-
-      context 'on creation' do
-        it 'automatically adopts the organization of its #customer' do
-          expect { ticket.save }
-            .to change(ticket, :organization).to(customer.organization)
-        end
-      end
-
-      context 'on update of #customer.organization' do
-        context 'to nil' do
-          it 'automatically updates to #customer’s new value' do
-            ticket.save
-
-            expect { customer.update(organization: nil) }
-              .to change { ticket.reload.organization }.to(nil)
-          end
-        end
-
-        context 'to a different organization' do
-          let(:new_org) { create(:organization) }
-
-          it 'automatically updates to #customer’s new value' do
-            ticket.save
-
-            expect { customer.update(organization: new_org) }
-              .to change { ticket.reload.organization }.to(new_org)
-          end
-        end
-      end
-    end
-  end
-
   describe '.search' do
 
     shared_examples 'search permissions' do
diff --git a/spec/models/user/updates_ticket_organization_spec.rb b/spec/models/user/updates_ticket_organization_spec.rb
new file mode 100644
index 000000000..769a201ca
--- /dev/null
+++ b/spec/models/user/updates_ticket_organization_spec.rb
@@ -0,0 +1,52 @@
+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+require 'rails_helper'
+
+RSpec.describe User::UpdatesTicketOrganization, type: :model do
+  subject(:ticket) { build(:ticket, customer: customer, organization: nil) }
+
+  let(:customer) { create(:customer, :with_org) }
+
+  context 'when ticket is created' do
+    it 'automatically adopts the organization of its #customer' do
+      expect { ticket.save }
+        .to change(ticket, :organization).to(customer.organization)
+    end
+  end
+
+  context 'when #customer.organization is updated' do
+    context 'when set to nil' do
+      it 'automatically updates to #customer’s new value' do
+        ticket.save
+
+        expect { customer.update(organization: nil) }
+          .to change { ticket.reload.organization }.to(nil)
+      end
+    end
+
+    context 'when #customer.organization is updated to a different organization' do
+      let(:old_org) { customer.organization }
+      let(:new_org) { create(:organization) }
+
+      it 'automatically updates to #customer’s new value' do
+        ticket.save
+
+        expect { customer.update(organization: new_org) }
+          .to change { ticket.reload.organization }.to(new_org)
+      end
+
+      it 'has made all changes with user id 1' do
+        expect(ticket.updated_by.id).to eq 1
+      end
+
+      # https://github.com/zammad/zammad/issues/3952
+      it 'does not send notifications' do
+        allow(NotificationFactory::Mailer).to receive(:send)
+
+        customer.update(organization: old_org)
+
+        expect(NotificationFactory::Mailer).not_to have_received(:send)
+      end
+    end
+  end
+end