I cannot figure out what is different about my use. I play very few games, surf mostly news sites, not even sites with a lot of 'stuff'. I've been in IT for close to 30 years and have plenty of experience tracking glitches down. I simply cannot figure it out and it's been going on for close to 2 years
But I'm not alone. There is a bunch of people with the same issues I have. There's a long thread over at Apple discussions about it. I have done everything I could find that is supposed to help, completely disable Spotlight, close apps from the multitask bar when I'm done. Never have more than one tab open at a time, etc. but Sarafi crashes about every third time I try to open it and about every 4th or 5th time I'm just browsing. I've checked the diagnostics and can see the low memory crashes. It didn't do this initially. Took about 3 months for it to start happening. I was constantly rebooting to free memory. Even bought an app to monitor it. I gave that 2 to my grandson and upgraded to a 3 when it came out. Sure enough it started again on that one but not nearly as bad. I could handle it. Apple says there's nothing wrong with it and in fact my husband uses that iPad now and it still crashes but not too often. And he's always on car sites and running YouTube.
So as I said, I'll probably try an Air. But it will be an expensive trial. If it's ok I'll keep it. If it starts crashing after my return period I'll gift it and get a Surface. 2gb of RAM would have set my mind at ease.
Sigh... I do love the form factor of iPads. I've had every version made (except the 4), I have a lot of money invested in the ecosystem, everyone in my family are using iPads (usually my old ones). Sometimes I just think Apple doesn't like me. But I'm an optimist and am keeping my fingers and toes crossed for the Air.