Hardware: Archer AX1800

Firmware: 1.2.1 Build 20201202 rel.76564(5553)

I recently purchased this TP-Link AX1800 / Archer AX21 v1.20 router to replace my NetGear Router because it wasn't supporting IPv6 well (which I need for work).

SSH sessions keep dropping.  Consider that I often have 6+ ssh sessions running (via tmux) this is a significant problem.  If I can't figure it out, I'll have to try a different router.

I have confirmed that SSH sessions are dropping regardless of whether it is over IPv4 or IPv6

I have ssh configured properly on my Windows machine to not drop idle SSH sessions.  It  worked fine with this computer and the NetGear router, so the only variable is the TP-Link router.

I suspect/hope that are TP-Link session or timeout settings that I am unable to identify that may resolve this issue. 

Please advice.

A possibly related problem: I am also noticing that ALL IPv6 access to the internet periodically drops out. I confirm this via https://test-ipv6.com/ which fails). I am able to continue working via IPv4 access.     Software disconnecting (ie via my PC network connectivity) to the TP-Link router and reconnecting to TP-Link router resolves the problem (and with the same IPv6 address).   This also causes all my ssh sessions to be lost, requiring re-logging in.   If solving this SSH session dropping issue doesn't also solve this IPv6 access issue, I will start a new thread on just that topic.

Thank you.