Summary
On Oct 19th, 2023 around 02:24:25 UTC Gnosis chain block producers suffered a network-wide block production issue that caused nodes to produce blocks with an invalid state root. Every node in the network (including the producer itself) rejected the blocks. As a consequence, the network did not see any new blocks for a period of multiple epochs until the error self-corrected. A total of 4 incidents happened on the same day. The incident resulted in a temporary loss of liveness. There was no loss of funds, nor slashings, nor long re-orgs to full nodes.
Read the post mortem report written by @dapplion