unbound crash every day

[nikkon]

Hi all,
I have a wierd unbond problem. It crashes once a day because of:

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2022-10-31T05:03:13 Error unbound [75750:0] error: remote control failed ssl crypto error:02FFF020:system library:func(4095):Broken pipe
2022-10-31T05:03:13 Notice unbound [75750:0] notice: failed connection from 127.0.0.1 port 14221
2022-10-31T05:03:13 Error unbound [75750:0] error: remote control failed ssl crypto error:02FFF020:system library:func(4095):Broken pipe

I have DNS over TLS enabled with cloudflare and under Custome Options I manually added

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tls-cert-bundle:  /var/unbound/unbound_server.pem
I have verified all CAs and Certifications. All (self signed + ACME) are valid

any clue what this error means?

[nikkon]

any clue ?

What am i doing wrong ?