The Ethereum mainnet recently experienced a disruption with missing blocks, raising concerns about the network's stability and performance. Ethereum core developers are investigating the situation, prompted by observations from beaconchain.eth. Ethereum developer Terence.eth hinted that the issue was returning to normal, with no action required. The problem, unrelated to the recent upgrade, has been ongoing for a week. Additionally, Ethereum developers have uncovered a threat to the network related to message size limits for RPC communication. It was discovered that an attacker could create high-paying transactions, forcing a majority of nodes to reject blocks. The bug has now been fixed in the clients.