This is ages ago, but did you ever get it sorted?
I'm still on an iPad 1, and have had the crashes ever since the upgrade, but think they're getting more frequent. As one commentator put it: "Like Windows, in the Win 98 era"
I've tried all the online tips I can find, including disabling functionality I never use, and removing unused applications. I don't think anything has improved it even temporarily.
Just about the only thing saving it from being scrapped is the ability still to listen to radio on iPlayer. For web-browsing, social media, or even checking e-mail, it's useful only to masochists now.