Unbound surprisinly quit after an update to 18.7.9. I've been using DNS-over-TLS for a long time now without issues and was surprised over the fact. Reverting to the previous Unbound version 1.8.1 solved the problem.
QuoteDec 13 21:43:04 kernel: -> pid: 86093 ppid: 1 p_pax: 0x850<SEGVGUARD,ASLR,NODISALLOWMAP32BIT>
Dec 13 21:43:04 kernel: [HBSD SEGVGUARD] [unbound (86093)] Suspension expired.
Dec 13 21:43:04 kernel: pid 86093 (unbound), uid 59: exited on signal 11
Dec 13 21:24:43 kernel: -> pid: 1801 ppid: 1 p_pax: 0x850<SEGVGUARD,ASLR,NODISALLOWMAP32BIT>
Dec 13 21:24:43 kernel: [HBSD SEGVGUARD] [unbound (1801)] Suspension expired.
Dec 13 21:24:43 kernel: pid 1801 (unbound), uid 59: exited on signal 10
miroco