2nd time O/2 sensor is needing replacing

[Astroman]

Well yesterday evening while driving in town I noticed an on/off jerkiness feeling while accelerating. About 5 minutes later the Yaris threw me a check engine light with code P2195 (first O/2 sensor on the header). Had it checked out and I need a new sensor.

About 5 years ago (maybe 6) I had replaced my stock header with a DC Sports header and had to get a new O/2 sensor put on as the old one broke. My question is how long should an O/2 sensor last and why would it suddenly start acting up? The car sat for nine and a half months last year (got it back mid September) but other than that it's pretty much been a daily driver with spirited driving. Would mods have anything to do with it? AEM CAI, 1ZZ tb, DC Sports header, custom built manaflow axleback.

The new O/2 sensor that is getting put in Tuesday (soonest I could get one and get it installed) will have a lifetime warranty.

Anyway, I'm just curious why it would go out all of a sudden like that..