After few years of using, now my B3 sometime has low output volume (SPL). It may not always correct, but if I use it daily, then SPL is normal, but if leave it turn off for few days or week, SPL is very low.


My configuration is WaveIO -> I2S --(direct)-> B3 -> IVY


I notice that the case of low SPL, volume port also not working, I could not turn it to zero sound. Voltage to B3 is still 5.25V and IVY is +-14.7V

Please advise me what to check or make it become stable.

Thank you.