Hi. I still do not have the possobility, to try your Issue with some other routers, but maybe, the Problem is reportet by other customers?
or maybe theres a Solution? And Sorry for the circumstances, but i am just about to report, or to show some Issues with the device(s).
I really think, recreate the issue, and solve the problem is the task of the manufacturer. I do really want to help, and give you as much information as possible, but i this case, i cant help without a huge amount of additional work and time.