I just found a video about the sudden death and reflow, but sorry, the language of the video is German:
To summarize: he’s is doing the repair in a more professional manner than oven repair. Cause of the sudden death is the flexibility of the plastic frame, which leads to a bending of the motherboards, and loosens the memory chip.
Since he knows how the repair the device, I will leave the link to his website: https://www.smartronik-repair.de/