Very slowly work WDC WD5000LPCX-00VHAT0

Hi, everyone. A couple of days ago, suddenly, my laptop started to load very slowly. First it was loaded 2 hours, then 4, and then about 5.
At the same time, the speed of reading and writing the disk was very small.
I have examined the drive using Victoria HDD, but SMART was GOOD! I don’t understand what could have caused this slowdown.!

Hi LongGlow,

I have sent a message, please check your WD Community Mail box.