shot in the dark - anyone running ipv6 on their arm boards?

I have a couple of Nanopi Neo Air. For quite some time they have been locking up, hard lock, LEDs on solid, but I have been unable to find any reason. They're both running Leap 15.2. The lock-ups happened sufficiently frequently for me to start thinking about a hardware watchdog even. For some reason, last week I decided to disable IPV6 on both of them, just a random impulse/thought. Now, one has 7 days uptime, the other 5 days, looking good. -- Per Jessen, Zürich (6.4°C) http://www.dns24.ch/ - free dynamic DNS, made in Switzerland.