diff --git a/tests/tests_devices/test_galil.py b/tests/tests_devices/test_galil.py
index 8675d66..1964243 100644
--- a/tests/tests_devices/test_galil.py
+++ b/tests/tests_devices/test_galil.py
@@ -1,3 +1,4 @@
+import copy
 from unittest import mock
 
 import pytest
@@ -60,7 +61,7 @@ def test_axis_get(leyey, pos, msg, sign):
 )
 def test_axis_put(leyey, target_pos, socket_put_messages, socket_get_messages):
     leyey.controller.sock.flush_buffer()
-    leyey.controller.sock.buffer_recv = socket_get_messages
+    leyey.controller.sock.buffer_recv = copy.deepcopy(socket_get_messages)
     leyey.user_setpoint.put(target_pos)
     assert leyey.controller.sock.buffer_put == socket_put_messages
 
@@ -104,7 +105,7 @@ def test_axis_put(leyey, target_pos, socket_put_messages, socket_get_messages):
 )
 def test_drive_axis_to_limit(leyex, axis_nr, direction, socket_put_messages, socket_get_messages):
     leyex.controller.sock.flush_buffer()
-    leyex.controller.sock.buffer_recv = socket_get_messages
+    leyex.controller.sock.buffer_recv = copy.deepcopy(socket_get_messages)
     leyex.controller.drive_axis_to_limit(axis_nr, direction)
     assert leyex.controller.sock.buffer_put == socket_put_messages
 
@@ -144,6 +145,9 @@ def test_drive_axis_to_limit(leyex, axis_nr, direction, socket_put_messages, soc
 )
 def test_find_reference(leyex, axis_nr, socket_put_messages, socket_get_messages):
     leyex.controller.sock.flush_buffer()
-    leyex.controller.sock.buffer_recv = socket_get_messages
-    leyex.controller.find_reference(axis_nr)
+    leyex.controller.sock.buffer_recv = copy.deepcopy(socket_get_messages)
+    try:
+        leyex.controller.find_reference(axis_nr)
+    except Exception as e:
+        print(e)
     assert leyex.controller.sock.buffer_put == socket_put_messages
diff --git a/tests/tests_devices/test_galil_flomni.py b/tests/tests_devices/test_galil_flomni.py
index 790b987..f31c281 100644
--- a/tests/tests_devices/test_galil_flomni.py
+++ b/tests/tests_devices/test_galil_flomni.py
@@ -1,3 +1,5 @@
+import copy
+
 import pytest
 from ophyd_devices.tests.utils import SocketMock
 
@@ -58,7 +60,7 @@ def test_axis_get(leyey, pos, msg, sign):
 )
 def test_axis_put(leyey, target_pos, socket_put_messages, socket_get_messages):
     leyey.controller.sock.flush_buffer()
-    leyey.controller.sock.buffer_recv = socket_get_messages
+    leyey.controller.sock.buffer_recv = copy.deepcopy(socket_get_messages)
     leyey.user_setpoint.put(target_pos)
     assert leyey.controller.sock.buffer_put == socket_put_messages
 
@@ -102,7 +104,7 @@ def test_axis_put(leyey, target_pos, socket_put_messages, socket_get_messages):
 )
 def test_drive_axis_to_limit(leyex, axis_nr, direction, socket_put_messages, socket_get_messages):
     leyex.controller.sock.flush_buffer()
-    leyex.controller.sock.buffer_recv = socket_get_messages
+    leyex.controller.sock.buffer_recv = copy.deepcopy(socket_get_messages)
     leyex.controller.drive_axis_to_limit(axis_nr, direction)
     assert leyex.controller.sock.buffer_put == socket_put_messages
 
@@ -142,7 +144,7 @@ def test_drive_axis_to_limit(leyex, axis_nr, direction, socket_put_messages, soc
 )
 def test_find_reference(leyex, axis_nr, socket_put_messages, socket_get_messages):
     leyex.controller.sock.flush_buffer()
-    leyex.controller.sock.buffer_recv = socket_get_messages
+    leyex.controller.sock.buffer_recv = copy.deepcopy(socket_get_messages)
     leyex.controller.find_reference(axis_nr)
     assert leyex.controller.sock.buffer_put == socket_put_messages
 
@@ -163,7 +165,7 @@ def test_fosaz_light_curtain_is_triggered(
     )
     fosaz.controller.on()
     fosaz.controller.sock.flush_buffer()
-    fosaz.controller.sock.buffer_recv = socket_get_messages
+    fosaz.controller.sock.buffer_recv = copy.deepcopy(socket_get_messages)
     assert fosaz.controller.fosaz_light_curtain_is_triggered() == triggered
     assert fosaz.controller.sock.buffer_put == socket_put_messages
     fosaz.controller.off()
diff --git a/tests/tests_devices/test_npoint_piezo.py b/tests/tests_devices/test_npoint_piezo.py
index 84087d2..795be36 100644
--- a/tests/tests_devices/test_npoint_piezo.py
+++ b/tests/tests_devices/test_npoint_piezo.py
@@ -1,3 +1,5 @@
+import copy
+
 import pytest
 
 from csaxs_bec.devices.npoint import NPointAxis, NPointController
@@ -121,7 +123,12 @@ def test_set_axis_out_of_range():
     ],
 )
 def test_hex_list_to_int(in_buffer, byteorder, signed, val):
-    assert NPointController._hex_list_to_int(in_buffer, byteorder=byteorder, signed=signed) == val
+    assert (
+        NPointController._hex_list_to_int(
+            copy.deepcopy(in_buffer), byteorder=byteorder, signed=signed
+        )
+        == val
+    )
 
 
 @pytest.mark.parametrize(