kresd occasionally fails to resolve domain names until restarted
On my Turris Omnia, since at least a few weeks or months ago (sorry I haven't kept track of when the problem appeared for the first time), kresd fails to resolve some domain names (with SERVFAIL) until it gets restarted or its cache cleared.
I have not kept track of all the affected domains (and there are probably some I didn't notice), but one that is often affected is one I control (sitedethib.com). I suspect that all affected domains use DNSSEC, but I am not sure of it.
The fact that it occurs more often for my domain than for others may indicate misconfiguration on my side, but the failures are somewhat recent while I haven't changed the nameserver's setup for years.
I don't have any more logs or information, but if you can think of a way to get more information next time it happens, I will be happy to oblige.