[russcasey]

I haven't had this problem - on resume my series 5 will connect to any remembered network - I've tested this with both my home router, the wireless hotspot app on my HTC desire and a couple of public networks. I suspect it doesn't affect the majority of users - perhaps there is something unusual about your wlan?

The reset/update sounds like a good first step, I'd also suggest trying it with a few wlans too. Please post up your findings, whether this solves the issue or not!