Region : Romania

Model : Archer C5

Hardware Version : Not Clear

Firmware Version : 3.14.2 Build 150317 Rel.34081n

ISP : RCS-RDS

Hello everybody!
I have a question regarding the Archer C5 v1.2 router and IPV6.
Is this router dual-stack?
I can connect to the internet via IPV6 and it's working just fine, but it's only working on IPV6.
Although it's showing as connected on both IPV4 and IPV6, i only have internet connectivity on either one of them.
When i connect to IPV6, it's working only on IPV6 for a couple of minutes then falls back to IPV4.
My ISP uses PPOEv6 with IPV6 prefix delegation.
Is this behavior a known bug in the firmware?
Searching through the internet i found out that this issue has been resolved for Archer C2 in the latest firmware.
Thank you!