The Customer Contact Center of Samsung Germany wrote me this:
“(…) A display exchange will not eliminate this phenomenon. The puzzle at the moment is that probably not all Gios are affected by this phenomenon. It seems, however, merely a software defect. Until this phenomenon is fixed due an update, please test yet if a complete reset is already bringing relief (...)”
(my translation in English)
My Gio has the official rom android 2.3.5 (S5660XXKS5-SER). I tried several older official roms before, but the problem still exists.
It reminds me of the Galaxy Nexus volume bug.
Has anyone the same issue or any ideas?