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It is important to firstly check somethings before any judgement on crawl requests.
1- Dont judge it too quickly and it may be a sudden drop for only one day. If it continues to be stable there that ...
As long as they are returning not found (404) codes, you are ok.
However, it would be best to check a few things to be on the safe side:
Check if those links are not being created by your own website....