Welcome to our community forum 
Right now there’s almost no experience yet with the FP4 in this forum, so it’s hard to say. I would really like to encourage you though to contact Fairphone Support and tell them about your issue. They rely on feedback to identify problems early and to deal with them.
Oh, and many here would like to hear how you got your phone this (comparatively) “quickly” – feel free to vote or respond in this poll whether you got it from Fairphone directly or from a bricks and mortar shop: