Lost WAN connection, was checking dmesg and noticed this. wireless was still working.
[85451.573214] ------------[ cut here ]------------
[85451.576496] WARNING: CPU: 0 PID: 3 at backports-2017-11-01/net/mac80211/rx.c:4347 0x82c26514 [mac80211@82c00000+0x61ca0]
[85451.587239] Rate marked as an HT rate but passed status->rate_idx is not an MCS index [0-76]: 98 (0x62)
[85451.596538] Modules linked in: ltq_atm_ar9 ath9k ath9k_common ath9k_hw ath pppoe nf_conntrack_ipv6 mac80211 iptable_nat ipt_REJECT ipt_MASQUERADE cfg80211 xt_time xt_tcpudp xt_state xt_nat xt_multiport xt_mark xt_mac xt_limit xt_conntrack xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_CT pppox ppp_async owl_loader nf_reject_ipv4 nf_nat_redirect nf_nat_masquerade_ipv4 nf_conntrack_ipv4 nf_nat_ipv4 nf_nat nf_log_ipv4 nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack_rtcache nf_conntrack ltq_deu_ar9 iptable_mangle iptable_filter ip_tables crc_ccitt compat drv_dsl_cpe_api ledtrig_usbport drv_mei_cpe ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables x_tables pppoatm ppp_generic slhc br2684 atm usb_storage sd_mod scsi_mod ext4 jbd2 mbcache crc32c_generic dwc2 gpio_button_hotplug
[85451.667460] aead cryptomgr crypto_null
[85451.669954] CPU: 0 PID: 3 Comm: ksoftirqd/0 Not tainted 4.9.111 #0
[85451.676117] Stack : 805e7892 00000036 00000000 00000001 00000000 00000000 00000000 00000000
[85451.684365] 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[85451.692659] 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[85451.700953] 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[85451.709248] 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[85451.717542] ...
[85451.719962] Call Trace:
[85451.722309] [<8000edb0>] 0x8000edb0
[85451.725675] [<8000edb0>] 0x8000edb0
[85451.729200] [<800271c8>] 0x800271c8
[85451.732636] [<82c26514>] 0x82c26514 [mac80211@82c00000+0x61ca0]
[85451.738553] [<80027200>] 0x80027200
[85451.741994] [<82c26514>] 0x82c26514 [mac80211@82c00000+0x61ca0]
[85451.747876] [<802c9c3c>] 0x802c9c3c
[85451.751320] [<802c9e48>] 0x802c9e48
[85451.754782] [<833fc37c>] 0x833fc37c [ath9k_common@833fc000+0x2a80]
[85451.760992] [<82ce78ac>] 0x82ce78ac [ath9k@82ce0000+0x160f0]
[85451.766578] [<802d6a00>] 0x802d6a00
[85451.769951] [<82ce4d90>] 0x82ce4d90 [ath9k@82ce0000+0x160f0]
[85451.775622] [<8002a790>] 0x8002a790
[85451.779032] [<80029fc0>] 0x80029fc0
[85451.782482] [<800495cc>] 0x800495cc
[85451.785946] [<8002a118>] 0x8002a118
[85451.789399] [<80040568>] 0x80040568
[85451.792840] [<80044a28>] 0x80044a28
[85451.796337] [<800448b0>] 0x800448b0
[85451.799826] [<800448b0>] 0x800448b0
[85451.803222] [<80040974>] 0x80040974
[85451.806674] [<8014a005>] 0x8014a005
[85451.810205] [<8004085c>] 0x8004085c
[85451.813557] [<80009798>] 0x80009798
[85451.817048]
[85451.818496] ---[ end trace 368f08669849794a ]---
root@DGN3500:~# cat /etc/os-release
NAME="OpenWrt"
VERSION="18.06.0"
ID="openwrt"
ID_LIKE="lede openwrt"
PRETTY_NAME="OpenWrt 18.06.0"
VERSION_ID="18.06.0"
HOME_URL="http://openwrt.org/"
BUG_URL="http://bugs.openwrt.org/"
SUPPORT_URL="http://forum.lede-project.org/"
BUILD_ID="r7188-b0b5c64c22"
LEDE_BOARD="lantiq/xway"
LEDE_ARCH="mips_24kc"
LEDE_TAINTS=""
LEDE_DEVICE_MANUFACTURER="OpenWrt"
LEDE_DEVICE_MANUFACTURER_URL="http://openwrt.org/"
LEDE_DEVICE_PRODUCT="Generic"
LEDE_DEVICE_REVISION="v0"
LEDE_RELEASE="OpenWrt 18.06.0 r7188-b0b5c64c22"