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It's probably not a bug, but more a feature of when the different parts of the startup sequence are completed. From experience most router/modems appear to complete the line sync process fairly early on after powering up. If connection time is recorded from when line sync is achieved, then that might explain it as there are often several other stages that the router has to complete before being fully up, like initialiseing DHCP and other server functions, NTP calls or whatever else is encoded in the start sequence.
I'd also add it depends when connection means. It it's just sync, then that's one thing, but it it's all the other stuff, like authentication onto the network, getting an external IP address and so on.
A look through the event logs after a full startup might give a clue.
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