I have a feeling that the node "c=" is experiencing some issues. The thing is, I've noticed that its capacity has decreased over the past few days. You can verify this yourself using the viewer at amb...
I recently closed a channel, no issues there. Based on my rating history (some metric generated by lnd-manageJ), the node simply did not perform well. The rating was OK/good until around January 22nd and dropped a lot afterwards. Note that the rating takes previous performance into account, so the actual change may have happened way before then.
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