So the best method I've found if you're running EvilNat with Cobra is to go to your Custom Firmware Tools folder, then navigate to Dump Tools, then finally scroll down to Dump SYSCON Error Log. I'd also recommend having a FAT32 usb plugged in so the dumb gets placed there, otherwise it will be put in the tmp folder of your internal hard drive.
It seems like I have the same issue you do, and my SYSCON is spitting out error code A0801002, which I researched online usually means failing NEC TOKIN capacitors. But I'm hoping someone else in this thread can let me know if there are any nuances to this, since it seems to happen most often when I'm playing backups I made of disc games I own and never when I'm playing the games off of the discs themselves (all on the same system).