Problem with telldus

I started with openhab a few weeks ago, so still new here. I have the telldus binding working with a tellstick duo, but it is not always turning on or off the sockets. I’ve looked at the openhab journal while switching, and it seems as if it is sending the commands to tellstick, but it seems that 50% of the time nothing happens to my nexa sockets. I haven’t been able to use the number of retries parameter, as this seems not to work. Any ideas?

This is an item from the items file

Switch Light_gOppe_Lampe_Sov “Lampe sov” (gOppe) {tellstick=“Lampe_Miriam_sov:Command” }