PowerDVD cannot access the storage device (Blu-rays)

Hello.
In the last month or so, i have this problem.
PowerDVD can't play Blu-rays.
It pops up the message of the title, and it can't play them.
The funny thing is that this doesn't happen all the time!
Sometimes, it works!
I mean just now, i thought to check just in case, and it worked. It played the Bluray!
Then, i restarted my pc, and that message again appeared when i try to play the Bluray.

(when it pops up that message, the region of the player has vanished and you have 0 changes for BLuray region).

I have tried many versions of PowerDVD. None works.

any tip?