Losing render files

[cmacfido]

I am working on a very heavy project with multiple sources, green screen and virual backgrounds.  It took me over five hours to render this thing out and when I shut it down and re-opened it, all my renders were gone. In fact one time I duplicated a sequence and lost half the render files.  I am on Premiere Pro 2020 and this is a major problem.  I have more of the shows comming and if this keeps up I will have to switch to Avid.  Is there anyway to avoid this?

[Peter Reef]

thanks for your help @JonesVid. i am working on a 30 min documentary with 50p UHD footag from Sony FX3 - mostly XAVC-HS. As its taxing the system I am mostly working with proxy files - prores proxy in UHD. Especially when restarting premiere or reopening the project this happens. Not all Render files are lost but suddenly there are a lot of yellow or red parts in the green timeline. I am working with adjustment layers for CC, sharpening Video filter, those are always locked and the lost files are not restrickted to a certain adjustment layer area.