On Sun, 13 Jul 2003 20:20:19 GMT, "Barbara Yanus"
wrote:

Has anyone bought the more expensive
ones and not had this problem?

I couldn't tell any difference by price. My theory is the daytime
high brings in moisture in the warm air that condenses on the inside
wall during the overnight low temperature. The moisture seems to
cause the ball to peel on the inside. You could keep it in air
conditioning and it should last a long time.

Regards,

Hal