Just noticed the same thing w/ my WT405. Have also recently noticed the power switch not turning the amp on every time I turn it on, have to switch it a few times for it to come on.
This amp is less than a year old and has not been used more than twice a month. I took a chance when I bought this amp knowing their recent QC/CS issues & was really hoping to have an issue free experience.
I'm afraid Eden's QC is going to end up driving me away from an amp brand that I really like & CS is a whole other issue to be dealt with soon enough.
Although I have yet to deal with their CS, the issues others have dealt with are enough for me, and unless my experience is awesome.....I'll likely be moving on.
It's a shame.