Only going from the translation, this seems more likely to be a maintenance issue or crew error than another shocking quality problem, since I believe the 737-8

Only going from the translation, this seems more likely to be a maintenance issue or crew error than another shocking quality problem, since I believe the 737-800 and -700s that they fly haven't been manufactured since at latest 2020, and their average age of their (Transavia's) 737 fleet is 13 years. As disappointing as it was watching the recent Wendover video breaking down the Boeing decline, this is probably not part of the story.