Hi Gunther

Thank you for sharing this idea.

I have this issue on the device after initial connection to my camera and turning it on, it immediately activated the shutter into multiple shots. had to turn it off to avoid damage on both device.
I reviewed the manual on operation and cant seem to debug where the error came from.

maybe you can assist in some way.

Thanks in advance.

Sounds like there might be a short circuit between the release pin and ground. Double check the wires and soldering!