@Banenabos - if you have a situation where the GW is just within reach, if the node during some circumstances does not reach the GW it will after 6 (?) tries start to search for a new way. In this way it might be the node hops back and forth between the GW and Repeater->GW.

I dont know whats the best practice is but when I had these situations i forced the ID to the repeater which was closest and most solid connection.

Not very knowing in the code but above is based on observation and what works best for me.

For example my rain/bucket sensor which is located in the garden can sometimes reach the GW directly but I lost connection to it back and forth. I added a repeater but for some reason it preferred the GW directly (less hops?) and lost connection over and over so I force it to use the repeater.

@Tommas - sorry, im not the code expert...
If it stops without any indication why it can be a power issue as well.

@Tommas - some resources i found.

https://forum.mysensors.org/topic/2432/si7021-multisensor-first-try
https://github.com/mysensors/MySensorsArduinoExamples/tree/master/libraries/SI7021
https://forum.mysensors.org/topic/6434/solved-problems-with-an-si7021-temp-humidity-sensor/3

@John-Mälarström - I have data timout to disabled which I think is correct.

Are you sure the GW isnt rebooting? If you have a rebooting GW my guess would be a power issue.
If not, maybe try another usb cable?

@gohan - did I ? Im sorry If i did...
My RFM modules have been working good and are as described.

@gohan - nope its not! I hope you will get your money back!
But atleast you know you can make it work and how!

@gohan - so you got communication now that is working? That is great news.

If I remember right, the GW can be upgraded to v2.2, and still communicate with nodes with earlier library versions.

Works for me as well. GW with 2.2 and nodes with everything from 1.4 up to 2.2.

@fhenryco

Since an inductor (im many cases a relay coil) cannot change it's current instantly, the flyback diode provides a path for the current when the coil is switched off. Otherwise, a voltage spike will occur causing arcing on switch contacts or possibly destroying switching transistors.

https://electronics.stackexchange.com/questions/100134/why-is-there-a-diode-connected-in-parallel-to-a-relay-coil