Carbonation level in bottles over time

I found that, with a couple of beers, the longer they sit at room temp, the carbonation changes. For example, I made an Irish Oak Bourbon Stout, most of which I kegged. I did bottle, however, approximately a gallon of it, using diluted priming sugar, bottling bucket, etc.

I bottled in the fall (October I believe) and I drank one not that long ago, and it almost had a champagne type of carbonation to it. When I drank some of them just a few weeks into conditioning, I didn’t get that.

Did I let them sit too long at 68 degrees or so before putting them in the fridge? After conditioning is over, is it best to them store them in a fridge?

The volume of CO2 is dependent on the amount of priming sugar you used. The only way it should change over time is that you started drinking them before they were fully carbed, which should take about a month. If they continue to Iincrease in carbonation it usually indicates a sign of infection. If they don’t change but are highly carbed then its simply over carbed.