Traveling regularly outside of the US with a Green card
A permanent resident card, also known as a green card, is the evidence that someone is a permanent resident of the United States. You can freely travel the world and return to the United States with your unexpired green card, provided you do not stay out of the U.S for longer than 6 months.
But traveling too frequently and staying away for many months at a time may affect your eligibility for citizenship and your status as a permanent residence. This is because U.S immigration laws require green card holders to be domiciled in the U.S, which means that you are living and working in the U.S with the intent to be living here for the foreseeable future.
Being domiciled could also mean that you own property in the U.S and your ties outside of the country are reduced. Traveling outside of the U.S and staying for long periods of time may be evidence that you lack the requisite intent to be domiciled here. Consequently, each time you go away and return, you may find yourself explaining to border officials why you travel so frequently.
Also, the government may take your green card away because traveling so regularly could be an indication that you lack the intent to be domiciled in the US and therefore do not qualify for a green card. In addition, you may be unable to meet the duration and actual presence requirements to be a U.S citizen.