THIS IS A TEST INSTANCE. Feel free to ask and answer questions, but take care to avoid triggering too many notifications.

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After a day of "investigations" I found an IP cam flooding the LAN with TCP retransmissions, which at the end went up to 20%, bad TCP up to 37%. Looks like her wifi transmitter went to junk, bandwidth was down to 7Mb/s. Switched it off for a test. After one night no disconnects any more. DNS still a bit slow, but I'll find this too.