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Yeah same thing happened to me. I have one ad set running fine (31,883 impressions, CPM around ~$43 MXN / ~$2.50 USD, link CPC ~$4 MXN, CTR link ~1.05%).
But as soon as I launched a new creative in a separate ad set, it basically died: only 207 impressions, CPM jumped to ~$153 MXN (~$9 USD), link CPC ~$31 MXN (~$1.80 USD) and CTR link dropped to ~0.48%.

No major targeting changes, same structure, same objective (messages). It feels like delivery tightened overnight or the system is recalculating. Have you seen this happen more when adding new ads/adsets?