Data provider Beaconcha.in shows that the ethereum mainnet suffered a brief outage, with a sharp drop in the number of proofs received by the mainnet from epochs 200,552 to epochs 200,554. The first problematic epochs occurred at 04:13 Beijing time today, and network data shows that the problem was resolved within half an hour. Ethereum core developers said via Twitter that they are still investigating what caused the outage and will report it to the community as soon as possible.