2010 chevy equinox o2 sensor out again

What is your question?

In late October I had to replace my O2 sensor downstream now 5 months later here i am needing to change it again. I used my obd2 scanner the first time & this time & its the same code . What would cause it to go out that fast? 2010 chevy equinox.. I only bring it to the shop at the dealership to have anything done to my car. I dont know what would cause the O2 sensor to go out that fast. My question is why does the same o2 sensor keep going out?

How long has your 2010 Chevrolet Equinox had this problem?

Little over a month