The PS5's Rest mode is supposed to make it easier for players to pick up where they left off, just like its PS4 incarnation. Unfortunately, several PS5 owners--including multiple GameSpot staffers--have reported the console's Rest mode appears to be causing a variety of technical issues, from persistent crashes to outright wiping saves.
Most users who have experienced these issues have been forced to rebuild their PS5's database, similar to what happens when you accidentally unplug the system or experience a power outage. However, there appears to be no solution to the save-wiping issue. Some users have even reported that Rest mode can brick your PS5, though it's not clear if that's actually the case. It seems the vast majority of these complaints involve Spider-Man: Miles Morales, which led Insomniac's James Stevenson to say that they're investigating the issue.
Seems like putting a PS5 into rest mode while Spider-Man Remastered is running crashes the whole system, forcing that "repair your external drive" process when you start back up. At least that's how it's been for me the few times I've done that today.— Jeff Gerstmann (@jeffgerstmann) November 11, 2020
Quick note on the PS5. Apparently sleep mode makes the system unreliable and rando crash. Had Godfall crash the system 3 times within in the span of an hour.— Tefty (@teft) November 14, 2020
The fix, give a fresh restart from the main menu and then don't let it go into sleep mode until it's patched.
Put my PS5 into rest mode, and when I booted it up, the console had completely shut off, and lost 2 hours of progress in Demon’s Souls (including the Tower Knight fight), and there was an error syncing my cloud save. I’m not mad.— KURT INDOVINA (@KURT_INDOVINA) November 14, 2020
We’re looking into this— James Stevenson (@JamesStevenson) November 11, 2020
We've reached out to Sony for comment. It's also worth noting that several GameSpot staffers have reported no issues with Rest mode. However, until Sony can acknowledge and look into these issues, it's probably best to turn off Rest Mode altogether. To do that, go to Settings, Power Saving, and then select the Set Time Until PS5 Enters Rest Mode option. From there, select Don't Put In Rest Mode.