Ring Doorbell 1 out of focus

Hi all i have had a ring doorbell 1 working great for the last couple of years. It is hardwired and 5 foot from a WiFi access point. Recently it died and so I ordered a brand new Doorbell 1 to replace it like for like. I did not go for the 2 as it is hardwired. I did not go for the Pro as the powered chime is not powerful enough for the pro, only the 1. The new one is out of focus compared to the original. Very very blurry. Nothing else has changed - same mounting, same position, same WiFi. Ring support agreed it was faulty, and a replacement has arrived today. The replacement is equally out of focus. Has something changed in the hardware? Is this just how it is now or should I be returning this one too?