I use quad9 DoH and DoT on adguard.
Just now it stopped working, sites fail to resolve. I see a bunch of timeout in the logs using 443. After removing DoH, it started working again. Adding back DoH did not break it.
Checking on ipleak, Global Transit (TIME) shows up for ipv4 while Woodynet(Quad9) shows up for ipv6.
Something is not right

AdGuard had been hijacked as well? Suddenly stopped working for me an hour ago, for both Maxis & Unifi

But you see, the ISPs are moving to "all in one" ont routers

TM with their (not great) D-Link or Skyworth or FiberHome all in ones
Maxis with their Huawei all in ones (a bit rare, I think maybe on their own infra only, the usual TP-Link/Kaon is more common)
TIME has fully commited to Huawei all in ones for a long time

All it takes is for then to pull a Indonesia and say "no bridging" and then we're in trouble