diff --git a/__pycache__/controller_db.cpython-38.pyc b/__pycache__/controller_db.cpython-38.pyc
index 84efc08..d75a0e9 100644
Binary files a/__pycache__/controller_db.cpython-38.pyc and b/__pycache__/controller_db.cpython-38.pyc differ
diff --git a/__pycache__/firm.cpython-38.pyc b/__pycache__/firm.cpython-38.pyc
index c41df15..f35eab2 100644
Binary files a/__pycache__/firm.cpython-38.pyc and b/__pycache__/firm.cpython-38.pyc differ
diff --git a/__pycache__/model.cpython-38.pyc b/__pycache__/model.cpython-38.pyc
index d3844ca..b7c8463 100644
Binary files a/__pycache__/model.cpython-38.pyc and b/__pycache__/model.cpython-38.pyc differ
diff --git a/controller_db.py b/controller_db.py
index 9aba433..bb1b520 100644
--- a/controller_db.py
+++ b/controller_db.py
@@ -82,8 +82,8 @@ class ControllerDB:
         # list_dct = [{'140': ['1.4.5.1']}]
         # list_dct = [{'133': ['1.4.4.1']}]
         # list_dct = [{'2': ['1.1.3']}]
-        # list_dct = [{'135': ['1.3.2.1']}]
-        list_dct = [{'79': ['2.1.3.4']}]
+        list_dct = [{'135': ['1.3.2.1']}]
+        # list_dct = [{'79': ['2.1.3.4']}]
         # list_dct = [{'99': ['1.3.3']}]
         # list_dct = [{'41': ['1.4.5']}]
 
diff --git a/firm.py b/firm.py
index 5428e4a..10c1166 100644
--- a/firm.py
+++ b/firm.py
@@ -94,8 +94,11 @@ class FirmAgent(ap.Agent):
                                     prod]['supply'].keys():
                             customer.dct_prod_up_prod_stat[
                                 prod]['supply'][disrupted_prod] = False
-                            customer.dct_prod_up_prod_stat[
-                                prod]['status'].append(('D', self.model.t))
+                            status, _ = customer.dct_prod_up_prod_stat[
+                                prod]['status'][-1]
+                            if status != 'D':
+                                customer.dct_prod_up_prod_stat[
+                                    prod]['status'].append(('D', self.model.t))
                             print(self.name, disrupted_prod.code, 'disrupt',
                                   customer.name, prod.code)
 
@@ -294,17 +297,19 @@ class FirmAgent(ap.Agent):
 
     def clean_before_trial(self):
         self.dct_request_prod_from_firm = {}
-        for prod in self.dct_prod_up_prod_stat.keys():
-            status, ts = self.dct_prod_up_prod_stat[prod]['status'][-1]
-            if ts != self.model.t:
-                self.dct_prod_up_prod_stat[prod]['status'].append(
-                    (status, self.model.t))
 
     def clean_before_time_step(self):
         self.dct_n_trial_up_prod_disrupted = \
             dict.fromkeys(self.dct_n_trial_up_prod_disrupted.keys(), 0)
         self.dct_cand_alt_supp_up_prod_disrupted = {}
 
+        # update the status of firm
+        for prod in self.dct_prod_up_prod_stat.keys():
+            status, ts = self.dct_prod_up_prod_stat[prod]['status'][-1]
+            if ts != self.model.t:
+                self.dct_prod_up_prod_stat[prod]['status'].append(
+                    (status, self.model.t))
+
     def get_firm_network_node(self):
         return self.firm_network.positions[self]
 
diff --git a/model.py b/model.py
index 8ae7b8c..034487c 100644
--- a/model.py
+++ b/model.py
@@ -311,9 +311,16 @@ class Model(ap.Model):
                                 [product.code == di_supp_node['Product_Code']
                                  for product in self.a_lst_total_products])[0]
                         # find a dfferent firm can produce the same product
+                        # and is not a current supplier for the same product
+                        lst_current_supp_code = \
+                            [self.firm_prod_network.nodes[code]['Firm_Code']
+                             for code in self.firm_prod_network.predecessors(
+                                pro_firm_prod_code)
+                             if self.firm_prod_network.nodes[code][
+                                 'Product_Code'] == di_supp_prod.code]
                         lst_cand = self.model.a_lst_total_firms.select([
                             firm.is_prod_in_current_normal(di_supp_prod)
-                            and firm.code != di_supp_node['Firm_Code']
+                            and firm.code not in lst_current_supp_code
                             for firm in self.model.a_lst_total_firms
                         ])
                         if len(lst_cand) > 0:
@@ -388,6 +395,8 @@ class Model(ap.Model):
         # remove edge to customer and disrupt customer up product
         for firm in self.a_lst_total_firms:
             for prod in firm.dct_prod_up_prod_stat.keys():
+                # repetition of disrupted firm that last for multiple ts is ok,
+                # as their edge has already been removed
                 status, ts = firm.dct_prod_up_prod_stat[prod]['status'][-1]
                 if status == 'D' and ts == self.t-1:
                     firm.remove_edge_to_cus_disrupt_cus_up_prod(prod)
diff --git a/xv_without_exp.csv b/xv_without_exp.csv
index c53192d..027114d 100644
--- a/xv_without_exp.csv
+++ b/xv_without_exp.csv
@@ -1,2 +1,2 @@
 n_max_trial,prf_size,prf_conn,cap_limit_prob_type,cap_limit_level,diff_new_conn,crit_supplier,proactive_ratio,remove_t,netw_prf_n
-10,TRUE,TRUE,uniform,10,0.5,0.1,1,5,2
+10,TRUE,TRUE,uniform,10,0.5,0.01,1,5,2