Slow ssd write speed on aerobook

i have some trouble with my aerobook.
I have recently see that the write speed of the ssd (netac 256gb) dropped to 49-50 MB/s and the read is at 350 MB/s. (tested with crystaldiskmark)

I have tried a fresh windows install but nothing changed. Anyone has experienced that problem?

I have tried all setting and guides saw on google but nothing has changed…
Help please

i have put the chuwi’s ssd on the m2 slot of my desktop mobo in order to make more tests and even there the max write speed is 50mb/s.

I have also tried to repair, format and test all sectors with easeUS partition master but nothing ghanged. All sectors are faultless accordingly with the results.

I have labeled the ssd as faulty and i’ll buy on other one