We don't manually close channels unless they weren't being used for at least a month. There are cases where channels get closed because of unresponsive nodes or bugs (Lightning isn't yet 100% robust).
It happened to me in minutes. I was unable to generate an invoice to refill my recently emptied wallet without paying another channel open fee.
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This is another reason why it seems your channel got closed by the network and not manually by Breez. We don't have any automation in place that close channels... Btw, closing channels is costing us funds. We would much rather keep channels open for active users.
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