# Note on an issue affecting a small set of nodes on the Polygon PoS network today (26th May 2021) **TL;DR:** There was an issue affecting a minor subset of the Polygon PoS validator and full nodes. The chain itself remained resilient and fully operational; no state or other inconsistencies were found. --- There was an issue reported today that resulted in sync inconsistencies for a small subset of the Polygon PoS validator nodes and full nodes. On height 5237861, the proposer of that Heimdall block went down for some time before gathering the prevotes. After coming back online, it again started to collect the prevotes of the previous voting round, but the other validators had already gossiped their prevotes, which lead to the "Error signing prevote" issue on the rest of the validators. However, waiting for the commit timeout fixed the issue. The repercussions of these were seen on the Bor nodes of the affected nodes, with block production and sync lagging behind on these nodes. Heimdall validator nodes sync data at periodic intervals from the Ethereum state sync contract (e.g. token deposits, validator stake and more) and after 2/3+1 consensus, relays it to the Bor chain. In this particular case, the synced data from Ethereum was propagated earlier on the affected nodes relative to the rest of the nodes that received data late due to suspected high load on the Heimdall node RPC. The rest of the chain progressed as expected. A short-term hot fix (https://github.com/maticnetwork/bor/tree/arpit/hot-fix-26-05-2021) was formulated to enable these nodes to sync back with the network. If your node was affected, please follow these instructions to apply the fix: ``` cd ~/bor git pull git checkout arpit/hot-fix-26-05-2021 sudo service bor stop make bor sudo service bor start ``` A more robust fix will be released shortly to mitigate this scenario. Note that the chain itself remained running and deposits from Ethereum worked as expected albeit with a slight delay in some cases. Thank you to the Vitwit team for helping out in identifying the issue and the resultant fixes.