If you want a passive award winning audio improvement for equipment breakin
and track3 a 5 minute system tuneup that works I have recommended this for years
the Isotek system runin cd
as far as your unit it may be a bad capacitor possibly . I would contact PS Audio
ths is not normal if anything it should sound better left on for its at its optimum running temperature I have been in several audio clubs for years and owned a Audio store , and have spoken with many designers ,you have a defective unit
PS audio Tech support for sure !!