This started today after i changed ISPs and updated to the lasted alpha build, with the ISP that i was using before the GPON ONT was in bridge mode and i was doing the PPPoE authentication strait on my RT-AC86U! But on the new ISP, they use a Nokia ONT, model G-240W-A, and it seems that there is no way to put it on bridge mode(at least no on this version of firmware that mine is using), so the PPPoE authentication is being done on the Nokia ONT, from ONT a cable is going to the wan on my RT-AC86U and the wan connection type being used is "Automatic IP", the mtu on the wan is 1500 and i tried to go into LAN->Switch Control -> Jumbo Frame On and OFF the result is the same...
The devices on my network right now are:
My desktop
Two xiaomi phone(both using 5ghz)
one xiaomi ip camera(the camera is using 2.4ghz)
Im going to test it with the pppoe connection mode with the old ISP since their service is still running.