I began to experience the same stuff at RU zone about a month ago.
I had NTP service at my home Mikrotik 4011 router for ages and never noticed it, but about a month ago load became enormous, about 1-2 million (!!!) packets per second, using all available bandwidth (500 Mbps).
I had to block NTP traffic on firewall because it looks as DDoS and my near-enterprise level router starts dropping packets on services I need.
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