[FS#964] odhcpdIPv6 node(Win 10) stops sending Router Solicitation but it still receives RAs from LEDE

[LEDE Bugs]

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FS#964 - odhcpdIPv6 node(Win 10) stops sending Router Solicitation but it still receives RAs from LEDE
User who did this - forfree (freefor)

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I was able to do remote syslog and also save some pcapng.

As I wrote in the my previous post, today my IPv6 was stable for over 6 hours.
So my IPv6 was UP from UTC 6:00 until UTC 13:32 when I started collecting logs.

UTC 13:32 - started wireshark on windows machine
- file pppoewan2-part1.pcap

UTC 14:20 - I checked with ipconfig and my PC didn't have any GUA address but only ULA.

UTC 14:31:11 - I manually shutdown the wan2 interface and reactivating the wan2 interface pppoe-wan2 came UP without any IPv6.
I captured a new pcap because the pppoe-wan2 went down terminating my previous tcpdump session. I also started capturing the
"nas0" interface because I thought it could be useful to understand why there was no IPv6 in the PPP request(I can upload it if needed).
I waited until 14:48:10 but still no IPv6 for pppoe-wan2 so I shut again wan2 interface.

UTC 14:48:30~ - I started again wan2 and here I made a mistake because I used the same filename(file pppoewan2-part2.pcap), 
overwriting everything from 14:31:11 to 14:48:10. 
IPv6 was stable at this point.

UTC 17:50 - I check with ipconfig and my PC didn't have any GUA address but only ULA. pppoe-wan2 went down again.
I don't remember if the pppoe session resumed on its own or I shut/unshut wan2 interface.. and I start a new tcpdump (file pppoewan2-part3.pcap)

UTC 19:49 - My IPv6 was stable and still is now that I am writing this comment (UTC 20:45)

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I noticed that the RAs/RSs problem is resolved but sometimes my pppoe-wan2 get disconnected. I guess this is a coincidence and could be my ISP's pppoe that is not stable.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=964#comment3337