(keitai-l) bitflipping out of the sandbox

This is a link from cnet. It is about an allleged security problem with
Java running in a sandbox, that has left me slightly agog... (An
increasingly common state, alas.)

http://news.com.com/2100-1009_3-1001406.html?tag=fd_top

------snip-----
He found that, if he could fill 60 percent of memory with the addresses, a
random bit flip would instead cause his attack code to run more than 70
percent of the time. 
------snip-----

Question:

Could one flip a bit with interesting frequency merely by leaving a keitai
out in the mid-day sun?

is this type of thing a possible danger in "smart wallet" or similar
applications?

Nick