Schiit Freya+(Plus)

I've have the original Freya for about a year and a half now and love the sound of tubes. This is my first tube preamp and I've had an issue that started about 9 months of using it. I have a noticeable pop in the left channel when I turn the volume up to about what I consider the 9oclock position. Believe me I tried switching every cable tube (left-right, right- left) and it still happens still occurs. Now to let you know when I switch L-R, R-L the pop comes out of the right channel. I sent it in to 
Freya and got it back telling me they could not simulate the problem. Got it back and it was ok for about a week and a half. I by no means don't like this pre or Schiit I will have to live with it because Im not going to pay any more shipping. This is not a rant, but maybe someone has an idea.

Do you mean when you switch the interconnect cables the pop switches sides?If so it's a loose connection in the cable.

I will try different cables, but I believe I tried that but I tried so many things now I'm not sure.

I've had a Freya+ driven by monoblock vidars for about a month now.  Loving it.  In researching the Freya I heard many reviewers commenting on how if you tap the top of the pre-amp you can hear it through your speakers.  I do the same and can't hear a thing.  Anyone else experience this? 

Just tried the same to verify, and I also hear nothing. My theory is it depends on whether your tubes have been tailored to avoid microphonics. Definitely a good idea with the relatively fragile little Freya, which unlike its Rogue and Prima Luna functional equivalents, is not built like a brick s*** house. (As how could it be at the price).