I've got an HP Laser Printer from about 15 years or so. About once a year, the printer stops responding and I have to remove the board, put it in the oven for 10 minutes or so to revive it.
What even is the theory on how that could possibly work? I believe you, it's just that I don't have any mental model of how baking a circuit board makes it work right for a year, and how it keeps working to fix the issue.
Laser printers have parts that can get very hot. If their "baking" reflowed the parts, but just barely, maybe those hot parts would just cause the exact same problem all over again.