We're at least three who all deterministically got that issue this morning of asd leaking like crazy. The latest beta firmware fixed it for me but that's very weird.
Same problem tonight as well, I noticed it also on the other thread. ASD starts leaking very fast.
Install the beta firmware from this page:
https://www.snbforums.com/threads/asus-rt-ax89x_9-0-0-4_388_31185-beta.82276/page-6
That fixed it for me. Registered to save you :D