Mirroring problem?

[Jonathan Underwood]

Hi,

Today I noticed a lot of mirrors were giving me this error on a dnf update:

[MIRROR] kernel-debug-modules-4.1.2-200.fc22.x86_64.rpm: Downloading
successful, but checksum doesn't match. Calculated:
ff4ac555966b587f06338475c8fcc0f41402b4c8e970e730f6f83b62be8b5c0d(sha256)
 Expected: 995c85b3e6b4a3e53ee53fb4e342c89487001812f55cde0a2f8636e956165684(sha256)

suggesting a lot of broken mirrors (I counted around 30 such messages)
- I wonder what's causing that?

Cheerss,
Jonathan