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Hi, I’m not sure luci can handle setuping up vlan interace on flint.
You better edit /etc/config/network, internet connection interface should be like this,

config interface ‘wan’
option hostname ‘GL-AX1800-d40’
option metric ‘10’
option proto ‘pppoe’
option username ‘my_username@isp.net’
option password ‘my_isp_password’
option disabled ‘0’
option ifname ‘eth0.500’
option ipv6 ‘0’

Could you tell what your setting of iptv interface?

Btw, “Timeout waiting for PADO packets” is more like link layer problem, you can try restart modem also.