Your basing this on the how many FP2s you had in your hands out of tens of thousands of FP2s sold?
Show me any forum of any electronic device where the majority of topics is not about users having issues with the device.
Actually I doubt there is any forum about any other electronic device where so many users that don’t have issues with it come by regularly to discuss so many different topics.
I’m pretty sure that if the sentence “the FP2 is not reliable” were justifiable, that Fairphone would not be where it is today.