Every time? Every time what happens?
I would argue that most bits of an iMac age* at a similar rate. I know this is roughly true for my son's 2010 iMac, which only just died (after having been given another lease of life for the past two years via an SSD transplant). I can assure you that neither he nor me would even remotely consider reusing that display...
* in terms of being due for an upgrade, not their technical lifespan, which can be very different
Would that be because of the dust/dirt streaks made by the fans underneath the display glass? This has happened on my last two iMacs, each time within the first year. One of my pet oeeves regarding these machines. I’m not going to perform a difficult disassembly so that I can temporarily fix a problem which I should never have encountered. That is, if these machines had been properly designed. It has been close to a decade with the same problem.