Samsung Galaxy 3 Issues

Problems encounter with Samsung Galaxy 3 mobile phone within 1 month usage:

1. Brows heavy web pages for some time and the 'Internet' browser crashes.
2. And after the problem 1 , phone restarts.
3. Battery suddenly drops from 40 % to 15%.
4. Voice Call quality is very poor in EAR phones.
5. When we replay the video in YouTube , it downloads again rather than using the cache.
6. Music Player : We cannot stop the song playing , we can only pause it. 

I have been using the Samsung Galaxy 3 mobile phone for past one month and above are the few issues i have encountered multiple times. Hoping Samsung takes up these issues and try to resolve them at earliest and please do not release phones unless regression testing is done on the phones. Quite dissappointed by Samsung phone :(