Help, Vegas do 100% for hours, then throw rejected all at once?

Having trouble figuring this one out, my Vega 56 and 64 are mining ergo to nice hash.
They do perfect 100% for 14+ hours, then they’ll BOTH throw a bunch of rejects at the same time.
If i restart the miners it’ll clear and they’re fine for another long period.
What could cause this to happen all at once?

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