Steinheil Crystal screen protector bubbles when warm

I applied a Steinheil Crystal Clear screen protector on my Bold 9650 about a week ago. Made sure to clean the screen VERY well before application, and made sure to not touch the adhesive. I was quite pleased for the first several days.

As the humidity has increased over the past couple days, it has started to bubble up. I can smooth the bubbles out, but they keep returning (not always in the same place). Furthermore, after a long call, when the phone gets a little warm the screen protector really bubbles a lot. Has anyone else had this experience with Steinheil products from SPG?

Thanks!