[color=blue]
> Well, I recapped all bottles. Well only 3 more acted in similar way, over
> carbonated... and only these had strange a bit sour taste... definitely
> different from others. All other bottles were nicely carbonated and great
> taste...
>
> What goes wrong when you get spoiled bottle? Is it possible that it was not
> sterilized good enough??[/color]
....[color=blue]
> PS. How often you get spoiled (sour) batch/bottle???[/color]


It does sound like you had a few bottles that weren't sanitized enough
(or something else like that happened - some dirty caps or something).

That particular thing has never happened to me. The only bad batches
I've had were when I reused yeast too many times and it eventually got
too much bacteria in it and the beer turned sour. But that was *all*
the bottles in the batch - not just a few.

Also, I once had a batch where the priming sugar didn't mix and got a
few bottles that were WAAAAAY overcarbonated and most bottles didn't
have enough carbonation. Had to open them all and re-prime according
to how much carbonation each bottle had... but that worked ok. (Now I
stir the priming sugar in, just in case! :)