I am successfully using the library on Device OS2.1.0...
@rickkas7 - Wasn't there something special/unique with pin A5 that you fixed for me in the library. I wonder if that is at play here somehow? Does this ring a bell? Maybe unrelated... but figured I'd mention it.
From this other post: Deep Reset Tutorial - #7 by rickkas7
I am currently using this as my pin configuration with no issues:
//Define pins for the RFM9x:
#define RFM95_CS D4
#define RFM95_RST D3
#define RFM95_INT D2
#define RF95_FREQ 915.0
// Establish instance of the radio driver
RH_RF95 rf95(RFM95_CS, RFM95_INT);