Aquara B1 curtain motor

Hi all,

I have 3 aquara curtain motors but since a while for one or other reason, homey looses the connection with it. I have to delete the motor from the system and reintergrade it after. It’s the same problem for each of them randomly.
Batterie OK, max 6 meters of homey,… I have others ZigBee devices, they all working fine…
it’s driving me crazy. Someone an idea?