I am using Prores LT proxies, from a preset I created in Media Encoder, with 4k Red footage. I am found that I was crashing quite frequently. I am using 2 different systems so fairly certain it is not a local issue. Work around seems to be having Media Encoder always open. Not sure if this is a common issue or not as I generally don't work with Red files although I frequently use LT proxies.
We're sorry to hear about this. Would you mind checking if any crash log is saved on the system? If you find the logs, please share a download link for the logs. It will help us to diagnose the issue properly.