The reason for this is the steadily increasing demand for flash memory, which is used in SDRAM, SD cards, USB sticks, tablets, VRAM, mobile phones, SSDs, etc. The main reasons for this are the increasing demand and production bottlenecks (the same machines are used for all types of flash memory). So increasing demand and production bottlenecks (the same machines are used for all types of flash memory) are the main reasons. That's why SSD prices are rising along with RAM...
According to rumours, things should calm down again by the end of the year. Let's hope so!
The real reason was and still is that there are only a few manufacturers (not brands) and at least one of them has reduced production for PCs this year and instead produced more something else, which led to the increase as described above due to high and increasing demand.