1) Try turning up your interface buffers... if that doesn't help try increasing your Read/Write cache
2) Revert back to an earlier version of the project (before you started using AS)
The reason I say this is because I've had the same types of issues (albeit in the original audiosnap... haven't tried the new version) and I'm pretty sure it was partially because I was driving the system harder than my latency/buffer settings could handle. Once the project started getting wonky it just became more and more corrupted the more I tried to screw with it.
So just keep in mind you are doing some pretty intensive stuff when using AS (especially if you are editing all 8 tracks at once) so you want to give your system all the power you can to succeed.
Cheers.