It could be a Google problem or a MacBook problem. The cause is uncertain but you can read more about it in this thread:
and this Google forum: https://productforums.google.com/forum/#!category-topic/chrome/mac/VeMcAm13LkE
Yeah, 32-bit Chrome gives the 64-bit cat major fits. And Google has refused to come up with a 64-bit version. So, if you insist, you will wear the power button shiny smooth.....
Oh, and the current Lion version is 10.7.5. You're either three behind or forgot to update your profile. The latest version does include lots of stability and security improvements. Might even delay the inevitable Chrome freeze a bit.