Autolysis is not really a concern EITHER in the fermenter or the bottle....it's really a non issue for the homebrewer. THe idea of autolysis being a serious threat to the homebrewer is several decades out of date. It's nothing you'll really ever face as a homebrewer in your lifetime.
Your beer is either simply changing/evolving, or you have a late onset infection...but it's highly doubtful autolysis has anything to do with it.
In the Dec 07 Zymurgy Charlie Papazian reviewed bottles of homebrew going back to the first AHC competition that he had stored, and none of them went bad, some had not held up but most of them he felt were awesome...We're talking over 20 years worth of beers.
This is a great thread about one of our guys tasting 4-5 years of his stored brew.
Nary a mention or worry about autolysis in the mix.....