It seems i can't edit my post.
I've ran the mhdd utility, and it's a more complex tool that i thought i would be (i.e. just another msdos hdd scanner

)
The scan results basically show that there are 24 "X UNC" sectors and it also warned me about other ~30 sectors.
Had 25 x >500ms, 38 x <500ms, 332 <150ms, 3381 >50ms, 65809 >10ms and 2381931 >3ms.
So there are 24 bad sectors, a few probably on their way to becoming bads - the ones i've been warned about and a few that aren't easly accessible - brown and orange blocks.
Hope the remapping will solve the problems, but the main question still remains...
Once an HDD develops a bad sector is it on the verge of collapse?
Anyway, thanks labtech for sharing the MHDD software, at least now i think i have an accurate diagnosis of what's wrong with the hdd.
@mr_spokk Yes, it's basically true, it probably hits one of the bad's or one of the hard accesible sectors and stalls resulting in drive fail due to lack of response.
@bgman No, the south bridge is fine, it has it's own heatsink added by me, and although it's warm, it's not hot probably about 35 celsius - witch it's been constantly for a few years, except for when turned off

The fan that i removed is a fan that was used for general airflow not an elementary fan because the pc is an "open case" one - as in it always has the lid taken off.