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beer changes flavor

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jimrod:
I have 2 beers on tap which were aged 3 and 5 months respectively. ( an imperial amber lager 8% and an Irish red ale 5.3%). Both tasted very good when I tapped them and now after sharing and enjoying these great beers, 2 weeks later they both taste different. I know there is a lot more head space in the kegs but what could cause these new flavors? The kegs are only half empty. Bad gas? bad tubing?

denny:
Can you describe the flavors you're tasting?

pachuquin17:
Do you clean your beer lines every week?

jimrod:
I change out my lines every year and run fresh water though the lines after each keg is finished. Sometimes I'll use line cleaner. I only drink 100 gal per year. These lines are only 6 months old.

The taste is almost like a grain alcohol taste with a hint of plastic but the whole flavor base is changed. The hoppiness is diminished and the deep flavor profile is diminished with an added after flavor.

But for weeks the beer tastes great, when its half gone is when I get the bad flavors.

tschmidlin:
I would start with cleaning the lines.  You say they are only 6 months old, but the good beer bars around here clean their lines every 2 weeks at a minimum.

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