I've manualy removed the call for watchdog reset from function
void doYield(void)
and I can see my user watchdog timer working again...
This will probably affect some deep sleep and waking processes - that I do not care about in my cases...
I used RadioHead library before, which is much more library in sense of composable part and I was very happy with it's long term stability...
Now I'm trying MySensors and it's quite unstable comparing to RadioHead... If it had software signing, I'd definitely use RadioHead...
Let's see if enabling user WDT will fix the unstabilities...