Brokenwood Graveyard Shiraz 2000 / question about oxidation.


Recently purchased the above noted bottle / opened... 'Re-corked' the
sucker since I was unable to finish the 750 ml bottle (3/4 still full).
I used one of those 'vacuum manual pumps' to remove most of the oxygen.
Back into the refig. it went..

Tried the same bottle the following day... The smell had completely
changed; the sweetness was non-existent. The hint of 'spice' didn't
exist at all (after taste)...

'Re-corked' the bottle... Opened it up 1 hour later, poured a glass and
let it 'breath' for approx. 45 minutes... The taste/smell is back!!!

'Re-corked' the sucker again... Opened it up again 4-5 hours later. The
smell / 'spice' existed.

I am confused - I have only been experimenting w/ wine for the last
3+ months. I've 're-corked' other bottles such as Wynn's CSM, MASI
Amarone 1997, and Sav. Blanc 2001 (which started turning bad after
4 days).

Any information / advice is much appreciated... Confused!