[atlas] half dead v1 probe ?

Hi,

Here at Tetaneutral.net we're hosting a V1 Atlas probe since 2012 or
so.
A few weeks ago it started beeing marked as unconnected on the ripe
atlas page : https://atlas.ripe.net/probes/523/

Since it's a v1 probe, I can only  power cycle it to try to reconnect
it, which I've done a number of times now, without success.

It's still answering to ping requests, both on its v4 and v6 addresses
and I can see some traceroute-like trafic going out of it.

It's marked as "firewall problems suspected", but we don't do any
firewalling on it. On IPv4 it's on a 1:1 NAT, all ports are open
and forwarded in both directions, and on V6 it's routed without any
filtering. Also we haven't changed anything on our infrastructure
around the time it became disconnected.

I'm starting to suspect a firmware upgrade problem as the one
mentionned by Alun Davis in
https://www.ripe.net/ripe/mail/archives/ripe-atlas/2017-June/003329.html

Any suggestion before I send it back and ask for a new one ?

Thanks in advance,
-- 
Matthieu Herrb