Someone said :
iPad has Wi-Fi problems, some users say
I have noticed that if I hibernate it (turn off screen), leave it for a while and then turn it back on the wi-fi is gone and I have to reassociate it in preferences again. This is an intermittent problem and only an irritation for me. I fully expect a firmware update will fix the problem.
Flash is, unfortunately all in Adobe's court. Apple wanted them to properly port it to the iphone OS but seemingly they rushed a sloppy version that is a power hog.
Although Flash is widely adopted to date, more and more content providers (google / youtube) are dropping it in favour of other protocols like html5.
Needless to say Adobe are quite worried about it.