Rfxcom and Entity not available

Hello to all the community,
I introduce myself Seb I am a new kid on the home assistant platform. I successfully installed this great home automation software on my Synology NAS. I have an Rfxcom key which is recognized in the home assistant. I manage to integrate all my switches. the Big problem is that when I restart home assistant I lose all my switches … with the following message: Entity not available: switch.0b11000e01fc7f620309j7y5. each time I restart it generates another no and becomes unusable.
Have you ever encountered this problem?
Thank you so much!

my configuration:

Example configuration.yaml entry for local serial device

rfxtrx:
device: /dev/ttyUSB0

sensor par moi

binary_sensor:
platform: rfxtrx
automatic_add: true

Example configuration.yaml entry

sensor:
platform: rfxtrx
automatic_add: true

Example configuration.yaml entry

switch:
platform: rfxtrx
automatic_add: false

Good evening everyone,
my problem is solved … in the rush I forgot to create my switch.yaml sheet …
Good evening friends!