I had the same issues as you (very poor battery live, performance of the phone not good anymore, wifi bugs, frequent crashes of apps, very bad camera quality) - timho hey really should have postponed or even cancelled the update to android 7. Instead of buying a new fairphone I think I’ll buy a used Samsung Galaxy S8. My wife already has a used galaxy S6 and it is just soo much better as my FP2 - and she never had to replace any parts of it unlike me. From a waste reduction perspective I’d assume that a used phone is even better as a new fairphone 3.