MD5 mismatch in Delta RPM

this is the 2nd time in less than a month :

/var/cache/dnf/updates-7exx87xxx825xx0d/packages/kernel-core-5.15.5-200.fc35_5.15.6-200.fc35.x86_64.drpm: md5 mismatch of result

/var/cache/dnf/updates-7exx87xxx825xx0d/packages/kernel-modules-5.15.5-200.fc35_5.15.6-200.fc35.x86_64.drpm: md5 mismatch of result

Some packages were not downloaded. Retrying.

Failed Delta RPMs increased 67.4 MB of updates to 105.5 MB (36.1% wasted)

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dnf clean all
dnf update
dnf upgrade
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Errors can occur with any download, at any time, and for many reasons. Dnf is smart enough to check the downloaded package and retry it until it gets a download that is acceptable. With delta rpms it will fail over to the full package as said by @vgaetera above.

It uses the same technique to switch to a different mirror site if it cannot get the requested package from the current mirror.