Over the past few days network members have been observing spontaneous force-closes of good channels, that were not initiated by either side. As of now an issue supposedly related to this problem has been raised on github. Fees management might be the root couse for this behavior. It might affect nodes with automatic or manual but intensive fees changes.

Please keep this in mind and clarify whether a really good channel was indeed closed by the initiative of the other side.

Github issue : https://github.com/lightningnetwork/lnd/issues/6793