Did you reseted your phone to fix the "Other Storage" problem?

It's like after the AMBER/GDR2 update, it's fixed for about week and up to
2 months (some reported that) then it goes back to "normal".

Doesn't fix it.

Give it a try though and please report your findings :smile:
 
I've hard reset once, and that was pre-Portico.
Other than that, never. I've had to carefully manage my apps and storage, though. wpTorrent is a big offender.
 
It's like after the AMBER/GDR2 update, it's fixed for about week and up to
2 months (some reported that) then it goes back to "normal".

Doesn't fix it.

Give it a try though and please report your findings :smile:
After the Amber update I did a couple of Hard Resets (one to fix battery drain issues). My Other Storage (as reported by Storage Check) seldom goes above 410MB.