Problem over SX1272 Registers

[Adamzat]

Hi everyone,

We have sensors in which we are using LoraWan Stack v4.4.1.

Since a few weeks we have observed a strange behavior. After many weeks of operation, some sensors (not all) still sending frames, but nothing is received by the Gateway.

After a deep investigation and sniffing the SPI, we have observed that some SX1272 registers have different and not expected values.

Below the list of registers:
Name / the observed value / the expected one (when everything is OK for a Join or Uplink)

REG_LR_MODEMCONFIG2 => "0xC0" => expected value: "0xC4"
REG_LR_DETECTOPTIMIZE => "0x03" => expected value: "0x43"
REG_LR_INVERTIQ => "0x01" => expected value: "0x27"
REG_LR_PAYLOADMAXLENGTH => "0x16" => expected value: "0x17"
REG_LR_PAYLOADLENGTH => "0x16" => expected value: "0x17"

When we reboot devices, every thing works fine and we have the good values again.
It is a very rare issue, and we cannot reproduce it.

We do not understand, why the SPI data corruption occurs.

Does anybody already observed this strange behavior?

Regards