I set up the phone as new monday and have had settings crash and last night I got a springboard crash. Im still pretty confident it is software at this point and will give Apple time to sort it out before I go to the genius bar. I don't have any kernel panics in the logs which are usually indicative of a hardware issue. Also the phone is not completely shutting off or doing a full reboot which can also be a hardware issue. Its just the springboard crash once or twice a week. I guess it depends on a combination off stuff your doing so that explained why some have it more then others and some none at all. Who knows as I cannot replicate it. It happened last night when I pulled down the menu from the top.
I had several kernel panics in each of my previous editions of the 5s, and full reboots. I think that you may be on to something for that indicating hardware problems. Fingers crossed that this little baby continues to behave as well as it has since the day I brought it home. I'm glad I was persistent in dealing with Apple. I'd still be having problems likely and would be more inclined to never want another iPhone. Now, I'm happy and the first three weeks of owning the 5s are swiftly becoming just a bad memory and these three weeks are a dream. I wish everyone well and hope that whatever your particular problems with the device are that they be resolved soon!
----------
So my new replacement phone just resprung when I was multitasking...
Grant it I had to really, really strain the phone, but it surely resprung.
Oh no!
Perhaps once a day you should do some 'housekeeping' on your phone (I know, I know, you shouldn't have to do this, but it might help until Apple gets their rear in gear...) and close out the apps that you're not using then. That way instead of letting them all stockpile up in the background using up resources--especially huge intensive apps (apps that involve the GPS like Maps, Weather; and apps that are graphic intensive; and apps like Facebook that suck memory for a reason I've yet to determine, lol). Also, have you turned background refresh off on all of your apps? I'm not sure if that's what helped me or not, but that's how I'm running right now.
Good luck!!!