Lights on the 4 wheel drive selector not working correctly

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2003 gmc Sonoma zr2 Indicator lights on the push button 4 x4 are not working correctly. I can get in it and drive for a little and the 2 hi indicator light will finally come on it might work for a day or two and then it will be off again. When the lights on the switch are not on nothing works no clicking from the module and when they are on you can hear clicking in the module I tried putting it in 4hi while they where working but the lights for 4 hi and 4 low come on and stayed on tried to put it in 2 hi and no clicking from module sat there for a few minutes and the light for 2 hi came back on and I have replaced the selector switch