问个问题，AC2100无法使用5G WiFi

U2Fsd***

遇到了个很奇怪的问题，我这个AC2100到手之后先刷的OP，然后用OP频繁掉线（属于WAN口直接没IP，需要重新拨号）
后来以为是OP的问题，就刷了hiboy大的padavan，但发现一个诡异的事
如果开了5G WiFi就很难拨号成功，提示“等待PPP客户端连接”。。。不过也有一定几率能拨号成功，但成功之后也十分不稳定，ping baidu时不时就请求超时，而且也会频繁掉线
关掉5G WiFi之后，拨号必成功，并且网络也十分稳定。。。感觉像是运营商的什么限制，但是自己又不清楚

开启5G WiFi掉线时的日志：

Jun 23 07:06:18 pppd[28953]: No response to 6 echo-requests
Jun 23 07:06:18 pppd[28953]: Serial link appears to be disconnected.
Jun 23 07:06:18 pppd[28953]: Connect time 9.0 minutes.
Jun 23 07:06:18 pppd[28953]: Sent 1200234 bytes, received 2480087 bytes.
Jun 23 07:06:18 R2100: WAN down (ppp0)
Jun 23 07:06:18 admin: 运行后 WAN 状态: WAN 状态:【down】, WAN 接口:【ppp0】, WAN IP:【10.252.68.244】
Jun 23 07:06:18 PPPoE: Disconnected
Jun 23 07:06:24 pppd[28953]: Connection terminated.
Jun 23 07:06:24 pppd[28953]: Sent PADT
Jun 23 07:06:24 pppd[28953]: Modem hangup
Jun 23 07:06:49 pppd[28953]: PPP session is 41576 (0xa268)
Jun 23 07:06:49 pppd[28953]: Connected to 04:25:c5:02:b5:27 via interface eth3
Jun 23 07:06:49 pppd[28953]: Using interface ppp0
Jun 23 07:06:49 pppd[28953]: Connect: ppp0 <--> eth3

开启5G WiFi提示“等待PPP客户端连接”日志

Jun 23 07:12:31 crond[23394]: crond (busybox 1.29.3) started, log level 8
Jun 23 07:12:47 R2100: Perform WAN manual reconnect
Jun 23 07:12:47 pppd[17329]: Unable to complete PPPoE Discovery
Jun 23 07:12:47 pppd[17329]: Terminating on signal 15
Jun 23 07:12:47 pppd[17329]: Exit.
Jun 23 07:12:48 DHCP MAN Client: deconfig (eth3): lease is lost
Jun 23 07:12:48 R2100: MAN down (eth3)
Jun 23 07:12:50 kernel: eth3: ===> VirtualIF_close
Jun 23 07:12:50 kernel: eth3: ===> VirtualIF_open
Jun 23 07:12:50 R2100: Hardware NAT/Routing: Enabled, IPoE/PPPoE offload [WAN]<->[LAN/WLAN]
Jun 23 07:12:50 R2100: Hardware NAT/Routing: IPv4 UDP flow offload - ON
Jun 23 07:12:50 R2100: Hardware NAT/Routing: IPv6 routes offload - OFF
Jun 23 07:12:50 DHCP MAN Client: starting on eth3 ...
Jun 23 07:12:51 pppd[23511]: Plugin rp-pppoe.so loaded.
Jun 23 07:12:51 pppd[23511]: RP-PPPoE plugin version 3.12 compiled against pppd 2.4.7
Jun 23 07:12:51 pppd[23521]: pppd 2.4.7 started by admin, uid 0

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