Braun Pulsonic Series 7 70S Foil & Cutter Replacement Head

First off, I’m a big Braun shaver fan and have been using them for over 25 years. I've had a Series 5 and three Series 7 shavers (upgrading as they add new features, with the cleaning stations & without) and only buy OEM Braun replacement foil heads. When first installed, these Series 7 replacement heads will give you the same close shave as when the shaver was new. However, I have never gotten 18 months of quality service from a head, as shown on the packaging. There is a noticeable reduction in the shaving effectiveness after about 10-12 months of daily use, making you repeatedly pass over areas of your face, so I generally replace the foil head once a year. But about half the time, the head breaks before I get to 12 months, with my latest purchase failing after only 2 months of use. The screen in the center, which is supposed to help raise and cut certain hairs, is the piece that fails most frequently in my experience. As you can see from the pictures, it is spring loaded and detaches from one end of the head. The exposed edge of this is sharp metal, so it will now scratch or jab my face on anything other than a broad smooth area, like under my lower lip or between my upper lip and nose. Sometimes, one of the 2 large side screens will develop a small hole, which can then scratch your face with edge of the sharp metal exposed by the hole, but this has happened to me less than the center screen detaching. It seems like one structure failure or another has been happening more frequently in recent years, before the blades actually wear down, so I'm not sure if Braun's quality control has dropped or the internal construction of the replacement heads has actually changed. It feels too frequent to chalk it up to bad luck. The premium price you pay for this Braun head over non-OEM versions makes this disappointing, but I’m too chicken to take a chance on the knock-offs, so I’m stuck with this until I get frustrated enough to change to a different brand shaver.