Sound of crossover degrading with time?

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I own a two way active crossover model Cabre AS45
It's been slightly updated with opa2134 and new lytics
Weirdly enough, it sounds good when I just turn it on then after about 30 minutes listening the midrange and treble range become somewhat dirty.
I've read of one Italian user having the same problem with his As45.
The crossover dates from the 80's so I suppose something is getting old and needs to be replaced.
As a wild guess I thought it must be something in thé PSU section but it's just my instinct talking. Maybe I need fresh regulators?...
I'd appreciate some advice.., thanks in advance!
 
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