SwapException occurred: Incorrect packet format for incoming data. Lack of (RSSI,LQI)

tengo problemas al recibir los datos, la salida de lagarto-swap.py da:

Quote:Rved: (0030)001E000A001E0C02A001EC
Register addr= 30 id=12 changed to 02A001EC
Temperature_30 in address 30 changed to 17.2 C
Humidity_30 in address 30 changed to 49.2 %
Rved: (0FFFFFFFC29)001E000B001E0B0C47
18-12-2017 19:50:51 SwapException occurred: Incorrect packet format for incoming data. Lack of (RSSI,LQI).
Rved: (0FFFFFFFD30)0031000C00310C02A001CC
18-12-2017 19:54:55 SwapException occurred: Incorrect packet format for incoming data. Lack of (RSSI,LQI).
Rved: (0FFFFFFFE2B)0031000D00310B0B42
18-12-2017 19:54:55 SwapException occurred: Incorrect packet format for incoming data. Lack of (RSSI,LQI).
Rved: (0930)002F000C002F0C02A201CA
Register addr= 47 id=12 changed to 02A201CA
Temperature_47 in address 47 changed to 17.4 C
Humidity_47 in address 47 changed to 45.8 %
Rved: (082E)002F000D002F0B0C59

le ocurre a 5 minibat 2.0 diferentes (3 de ellos esporádicamente y 2 de ellos frecuentemente)

he probado con otro panstick diferente con resultado similar
he probado a cambiar las ubicaciones de los sensores.
sucede mas frecuentemente cuando alejo los sensores.

encontré en el foro http://www.panstamp.org/forum/archive/in...-5618.html

¿a que puede ser debido?