2007 Camry XLE V6 - VSC Warning Light - O2 Sensors - Sixth Time

[mitch5280]

Hi,
This started about a year ago, here's the quick recap from taking my car to a local mechanic that I trust:

• VSC Light came on - they changed 1 of the Oxygen Sensors
• VSC Light came on a couple a weeks later - they changed all the Oxygen Sensors including the first one
• About 6 months later the VSC light came on - they changed all of the Oxygen Sensors
• They have now changed all of the sensors 6 times, they are ordering all of them again, this time directly from Toyota.

Is this common on a 2007 Camry XLE / V6 that only has about 90,000 miles?
Could it be something else, there diagnostic equipment keeps saying the sensors.

Thanks,
Mitch