Z-wave warning in log

Hi,

After adding 2 new doorsensors (ZW112 Door/Window Sensor 6) i get this kind of warnings in the log:
15:48:33.143 [WARN ] [l.serialmessage.SendDataMessageClass] - NODE 8: Already processed another send data request for this callback Id, ignoring.

And directly after this warning it seems that a rule is triggered that NODE 8 in involved in. It should activate a doorbell when door is opened, but after the warining the doorbell sounds even when door is closed. Node 8 is the same doorsensor and has been working without a problem before adding the new sensors.

Any ideas on where I should start troubleshooting. I get this warning for NODE 12 and 13 also, which are the two new doorsensors.

/Stefan