[FS#668] ipv6 not working after some time

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - lucize (lucize) 

Attached to Project - LEDE Project
Summary - ipv6 not working after some time
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - LEDE Reboot SNAPSHOT r3900-399d5cf / LuCI Master (git-17.090.47373-d4816de)

after some time my ipv6 connection is not working anymore, if I make a release/renew ipv6 address on the client computer it will work again, this is a pppoe connection with ipv4 and ipv6 support.
I don't remember when it started with this behavior but I don't remember any LEDE version to be working ok

Regards

One or more files have been attached.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=668