The lies of the mission reset timer may be part of a bigger problem that had already existed. Since I started playing the timer on the battle page that claims to be showing how much longer a particular judge will be judging has NEVER been accurate. It will be counting down to something 4 or 5 or 6 hours away, but then suddenly an hour or two later there's a different judge. I've noticed something like that with missions as well. The timer starts counting down 24 hours, but might actually reset 6 or 12 or 18 hours later (arbitrary examples, haven't kept track to be exact but it's clearly been all over the place).

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I usually only see it when there's about 4-5 hours left on the timer before any new ones show up.