hi, last night i was transferring some files from my desktop to the tablet's extsd and everything proceeded as normal. Used it afterwards for watching some movies and everything was fine, untill i tried to open the default Music App. Then it'd tell me that there's a problem "with usb (disk?)" which made the music app to scan for it... forever. Anyway, i forced shutted it off because it wasn't responding at all and next morning i had troubles booting it up.
In particular it would get stuck on the chinese loading page and just wouldn't proceed. After many tries and reboots, i managed to finally access android. But my problems were far from over....

First of all, the "home button" stopped working. Both the one on the device and the android screen one. Then, opera doesn't work anymore (maybe more programs). I opened Titanium Backup and it stated that my Android ID has changed, probably due to a factory reset (!?) which i obviously never willingly did. After i shutted it off and started the tablet again, titanium wasn't working either.
The freaking music app, which started the problem last night, was working flawlessly...

Oh, also i don't get a lock screen anymore and i could hear sounds whenever i touch the screen (i had disabled those long ago).

Any clues? I am going for vacations tomorrow and would really appreciate all the help i can get, so to fix this issue and make the tablet start working as usual again.