That is actually a common issue. We recommend running pull task several times a day at different times, as you may be hitting a site as it is being replicated to. If it fails consistently, no matter what time the pull is run, then that is a problem, but if it occasionally fails like that and then later succeeds, just ignore the failures.
If it is a consistent failure, you can also try removing the dat from the master repository and pulling it again, and / or download it from the security updates page and check it in manually. Subsequent pulls may then succeed. It all depends on what the exact issue is.
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