the eMMC flash freezing saga continues...

Got a new N900 from amazon - worked well for 4 days, though battery was weaker than expected. Installed applications, adapted all my contacts transferred from my (recently stolen) N95... and then - the black beauty froze and couldn't reboot. On the recommendation of a more experienced user, I flashed the phone - and it woke up again (though I lost all my adapted contacts)!

But ever since - application memory is full, internal errors happen daily... I even had to uninstall some of the very few applications to be able to add some new contacts - because they strangely save in the application memory (or I don't understand where).
I studied all possible solutions. eMMC flash though did exactly the same as described above - it freezes - and my memory remains full (although almost no applications installed).

I literally tried all the advice I could read - I even booted ubuntu USB - and tried there - but not knowing where the maemo flasher installed in ubuntu - I used a nice script published on nokia.com forum - which was apparently helpful to everybody but me. Because even with ubuntu - eMMC freezes.

I didn't restart between OS and eMMC flashing, I took out battery hundreds of times, I tried to clean N900 as root (I'm really not an IT - but I learn fast). NOTHING HELPED. Btw - my comp runs Vista - I didn't chose it - it was the only available option to me at that time (and Ubuntu, however beautiful it is, didn't work any better).

I just want to free the bloody full application memory. Anybody got any new clever idea? Thank you in advance...