Default [Q] Internal Storage missing, anyone?

I'm owning the international version of the HTC One running one of the M8 Ports. After few weeks with no problems, today I saw that Blinkfeed won't show any photos, only the text. I've tried clearing data of the app, no result. After that, I've noticed that there was nothing in the Gallery, nor the Music app.

I've tried to take a photo but it said "Unable to save photo to SD card due to insufficient permissions". I've connected the phone to the PC and there was only about 800 mb of storage. All in all, the "32gb" internal storage was no longer there. Tried to reboot the phone, no result. Then, I've thought mounting the SD Card in the Recovery will solve it (system and data were already mounted), also tried Fixing Permissions. After few other reboots, it worked. Should I expect this issue appear again? Maybe a SD Card failure?