It was not known until 2 or 3 weeks ago. Jer had a 400 doing the same thing , nadude's 400 drove him nuts for awhile and Tim's 700 dud the same for me, but in both cases the root failure was not the same as yours. So it's not wise sometimes to apply the same fix if the root cause is not the same.ALL failure modes are not known for a White Oak amp yet. Joe is not God. The amps in question are not on his bench , so he does the best he can with the information he has , which is often incomplete , and with all of us having different levels of competency , he must feel like he's walking through a minefield most of the time.
In my day job I'll have pumpers call in with a problem. A lot of things can go wrong with an oil well or disposal plant. Solving those problems over the phone doesn't happen all the time. Often I have to show up on location , and usually , a component has failed. Whether that component failed because some one left the wrong valve closed (or open) , or the wrong switch on (or off) is impossible to determine sometimes...BECAUSE I WASN'T THERE. I've been doing my job since the fall of 1975, yep , 41 years, and I still don't know or have seen , all the ways something can go wrong in a million dollar injection plant. They are like a giant circuit, with mechanical and electrical and human components, buy unlike Joe, I can actually go out and SEE what is happening (or not happening), and it still drives me nuts sometimes. Imagine how Joe feels sometimes . Here we are trying to assemble and use his creations in often abusive ways, often to the point of destruction, through no.fsult of his own, and he is called on to help fix it. I have literally destroyed a few amps, and Joe has patiently and kindly guided me through their resurrection and at times has modified his design to alleviate some of the damage caused. From personal experience I know how frustrating that can be. In the oilfield we call that " making it wormproof", a difficult process at best. Joe does a damn good job in that regard. The WOPL'S are a lot more robust than whence they started and will continue to be moreso.
So, why the long diatribe?? Your comment on it being a " known issue". It can't be known until it can be replicated, and how do you replicate YOUR root failure? How do we replicate any mistakes along the way? This is not a perfect process, but the end result of having a Top of the Line amp at a fraction of the price is worth a bump or two along the road , and a lot of dedicated and committed people here are willing to help, and we also.have day jobs and other responsibilities that may interfere with timely help. And then there's the numerous emails, pm's and parallel troubleshooting going on behind the scenes that you aren't aware of. I would love to to dedicate more time and effort to the process, but right now Marlin Oil is fighting for its life and with so many external factors beyond our control it's a 50/50 proposition right now.
So, to sum up, your problem WILL be solved, one way or the other......