The problem might come from the core-module. Or you could have a second defective bottom-module or battery (which is possible, though statistically not likely).
I have had a similar problem with my phone, it was caused by a kernel wakelock. I had a big battery drain, and one day, it just didn’t want to charge nor switch on anymore, though the red light would switch on for 5 seconds and then switch off. The problem was with the core-module. Is your phone still under warranty?
I hope you’ll find a fairphoneangel able to help you.
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