Rendered audio waveforms disappear after restarting - or sleeping

[defaultxx7idsf05mlq]

I don't have waveforms in my multicam. So I Render audio and they appear as usual. Then after my computer reboots or premiere shuts down or sometimes even sleeps the rendered audio waveforms dissapear and I have to re-render them. Its a long process.

- Why is this happening

- Does premiere save the rendered info somewhere I can relink to?

[defaultxx7idsf05mlq]

Well I noticed in mulitcams (13.1.0) You need to have the same number of audio clips in your sequence as you hace "unmuted" in the multicam nest. 

However, when I edit one sequence into another sequence (like an "best interview bites" sequence) into my main timeline. The Waveforms are not there. In the mulitcam there is only one audio channel so it's not the same issue.