devo7e with RFM23BP module

I have upgraded my devo7e with deviationtx, and use the PPM out to oplink(with RFM22 module and max power is 100mW)


If the module's power set to high level,such as 100mW, when the antenna close to the LCD, menu will go to be mass, seems RF EMI cause the firmware's ScanButtons function get the button press. and when set to lower power level, it is OK. I also use my amateur radio do the test, got same results.
is it possible to improve the firmware's ScanButtons function to reduce the RF EMI