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Hello and welcome to just answer my name is ***** ***** I will be the one to assist you. It sounds like the problem you are having is with your thermocouple and it will need to be replaced.
While holding down the control knob for the pilot, you either have to use the pilot ignitor or match light the pilot. Then old the knob in for 60 seconds, before releasing it. If the pilot remains lit, turn the control knob to ON. If the pilot does not remain lit, the Thermocouple or Thermopile may needs replaced.
Since you said its shutting off every few days sounds like that is what your problem is. It is lighting but not staying lit. Once you replace this part the problem should be fixed. I hope you find this information helpful and will be willing to rate with 5 stars at the top so I can be credited for my time. Rating does not stop you from getting back to me in the event you need me.