An intriguing and plausible theory! In my case though it seems that the lease is 86400 seconds (24 hours), or at least that's what the router is claiming to giv

An intriguing and plausible theory! In my case though it seems that the lease is 86400 seconds (24 hours), or at least that's what the router is claiming to give out. So I don't think this is it. My guess is that renewing the DHCP lease has some side effect of resetting the session, rather than it being the actual DHCP lease renewal that is important.