~snip~
Good for you.
I haven't paid €300/stick just to put one aside accepting "this is how it is"... 
I rather try to find an explanation why is one behaving so weird. There's a solution for everything. And yes, this is lottery and has to be fun not a struggle.
Good for you.
I haven't paid €300/stick just to put one aside accepting "this is how it is"... I rather try to find an explanation why is one behaving so weird. There's a solution for everything. And yes, this is lottery and has to be fun not a struggle.You say that 7 of them are working fine and the 8th one doesn't work properly, right?
Also that you're using the USB hub from GekkoScience?
https://i.imgur.com/oOCYxQD.jpg
One of the USB ports is designed to connect a fan, so it's power only.
That could be an explanation for your issue.
I am running 7 CompacFs right now on t2 Gekko hubs and my 8th stick does the same as yours.
He made a typo I guess and he's using "2 Gekko hubs", if I'm right.
Yes, that is correct that I am running 4 sticks on one Gekko hub on ports 2, 5, 7 &4. I have 3 sticks on the 2nd Gekko hub using ports 2, 7 & 4.
The one stick I am having the issues with has never really been stable, it will always run for a while, but it slowly ticks down to zero eventually. While it is doing this the hash rate suffers. I will get back to working with it, just life is really busy right now with travel for work. The other 7 sticks just run at 540MHz without any issues. I would have to constantly go un-plug and re-plug this problem stick in.