I definitely still have this problem, just a minute ago my phone went into soft lock with a black screen, until a whatsapp voice message was completely played back and I finally got control back. I always install the latest updates when they come out. This “Proximity sensor goes crazy in sunlight” issue is seriously the single most disappointing thing about my Fairphone. I am satisfyed with everything else (altough standard camera app is a bit underwhelming, but usable).