Boss TU-2 not silent?

[BassmanDk]

Sometimes my Boss TU-2 isn't completely silent when i use it. Meaning that when press it to switch basses it gives some crackling noises or when the jackstick hits some metal ( drum kit) it gives out some loud cracks. I thought it completely "kills" the sound but no apperantly.
What gives? otherwise i'm very happy with the function of this pedal.

[RickenBoogie]

Could be a cable problem, my TU-2 is dead silent.

[BassmanDk]

it's very obvious that the noise is made on instrument side of the tuner. And it's the first pedal my signal sees. And it does it with various cables, so no to a defect cable!

[lowendgenerator]

I also don't have this problem. Contacting Boss would be your best bet.