Audio Preview Behavior

I've noticed that SO3 has a rather aoying behavior of making a multitrack recording, and then, no matter how long I wait, or what combination of saving and waiting I perform, if I close SO3 and to mix the song later, only 2-5 of my audio previews (waveforms) actually save...which means I have to wait about 5 minutes for them to regenerate. Once they re-generate, I have no issues with them disappearing again -- it's just during the initial record. I'm typically doing mulit-tracks with around 20-31 chaels, and attempting to go ahead and mix with the waveform previews generating causes drop-outs.

My setup when doing these is with a Macbook Pro (2015) with an external USB3 hard drive. Outside of this, I have no other issues with SO3 (minus my request to be able to quickly split a "song" into multiple songs from SO3, like we can from Capture -- which doesn't work on our massive dante network.

Thanks!