spyder: ZMQError: Address already in use when restarting the kernel

I have installed Anaconda (python 3.7) in my ubuntu 20.04 system and I am using Spyder. I am running CNN and while runs for some part of data it’s fine but when I run it for entire data (more that 100000) I am getting the following error:

an error occurred while starting the kernel

Steps that reproduce the problem:

1. run the code
2. running for about 20 minutes
3. Spyder tries to restart the kernel
4. error raised

Traceback (most recent call last):
File "/home/exx/anaconda3/lib/python3.7/runpy.py", line 193, in _run_module_as_main
"__main__", mod_spec)
File "/home/exx/anaconda3/lib/python3.7/runpy.py", line 85, in _run_code
exec(code, run_globals)
File "/home/exx/anaconda3/lib/python3.7/site‑packages/spyder_kernels/console/__main__.py", line 23, in 
start.main()
File "/home/exx/anaconda3/lib/python3.7/site‑packages/spyder_kernels/console/start.py", line 284, in main
kernel.initialize()
File "/home/exx/anaconda3/lib/python3.7/site‑packages/traitlets/config/application.py", line 87, in inner
return method(app, *args, **kwargs)
File "/home/exx/anaconda3/lib/python3.7/site‑packages/ipykernel/kernelapp.py", line 567, in initialize
self.init_sockets()
File "/home/exx/anaconda3/lib/python3.7/site‑packages/ipykernel/kernelapp.py", line 271, in init_sockets
self.shell_port = self._bind_socket(self.shell_socket, self.shell_port)
File "/home/exx/anaconda3/lib/python3.7/site‑packages/ipykernel/kernelapp.py", line 218, in _bind_socket
return self._try_bind_socket(s, port)
File "/home/exx/anaconda3/lib/python3.7/site‑packages/ipykernel/kernelapp.py", line 194, in _try_bind_socket
s.bind("tcp://%s:%i" % (self.ip, port))
File "/home/exx/anaconda3/lib/python3.7/site‑packages/zmq/sugar/socket.py", line 173, in bind
super().bind(addr)
File "zmq/backend/cython/socket.pyx", line 542, in zmq.backend.cython.socket.Socket.bind
File "zmq/backend/cython/checkrc.pxd", line 28, in zmq.backend.cython.checkrc._check_rc
zmq.error.ZMQError: Address already in use

Versions:

• Spyder 4.2.1:
• Python 3.7.9:
• Qt 5.15.2:
• PyQt 5.15.2:
• Linux/5.4.0.65-generic:
• Ubuntu 20.04

Dependencies:

# Mandatory:
atomicwrites >=1.2.0            :  1.4.0 (OK)
chardet >=2.0.0                 :  4.0.0 (OK)
cloudpickle >=0.5.0             :  1.6.0 (OK)
diff_match_patch >=20181111     :  20200713 (OK)
intervaltree >=3.0.2            :  3.1.0 (OK)
IPython >=7.6.0                 :  7.20.0 (OK)
jedi =0.17.2                    :  0.17.2 (OK)
jsonschema >=3.2.0              :  3.2.0 (OK)
keyring >=17.0.0                :  22.0.1 (OK)
nbconvert >=4.0                 :  6.0.7 (OK)
numpydoc >=0.6.0                :  1.1.0 (OK)
parso =0.7.0                    :  0.7.0 (OK)
pexpect >=4.4.0                 :  4.8.0 (OK)
pickleshare >=0.4               :  0.7.5 (OK)
psutil >=5.3                    :  5.8.0 (OK)
pygments >=2.0                  :  2.7.4 (OK)
pylint >=1.0                    :  2.6.0 (OK)
pyls >=0.36.2;<1.0.0            :  0.36.2 (OK)
pyls_black >=0.4.6              :  0.4.6 (OK)
pyls_spyder >=0.3.0             :  0.3.0 (OK)
qdarkstyle >=2.8                :  2.8.1 (OK)
qtawesome >=0.5.7               :  1.0.1 (OK)
qtconsole >=5.0.1               :  5.0.2 (OK)
qtpy >=1.5.0                    :  1.9.0 (OK)
rtree >=0.8.3                   :  0.9.4 (OK)
setuptools >=39.0.0             :  52.0.0.post20210125 (OK)
sphinx >=0.6.6                  :  3.4.3 (OK)
spyder_kernels >=1.10.1;<1.11.0 :  1.10.1 (OK)
textdistance >=4.2.0            :  4.2.1 (OK)
three_merge >=0.1.1             :  0.1.1 (OK)
watchdog >=0.10.3               :  1.0.2 (OK)
xdg >=0.26                      :  0.27 (OK)
zmq >=17                        :  20.0.0 (OK)

# Optional:
cython >=0.21                   :  0.29.21 (OK)
matplotlib >=2.0.0              :  3.3.0 (OK)
numpy >=1.7                     :  1.19.2 (OK)
pandas >=1.1.1                  :  1.1.0 (NOK)
scipy >=0.17.0                  :  1.5.2 (OK)
sympy >=0.7.3                   :  1.6.1 (OK)