oh my god .. NOOOOO! this one behaves the same
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today I tested my internet speed, discovered I only had ~60mbps out of the ~100mbps the router is capable
next thing I did was to enter the Status tab and check the log - the router rebooted itself
did a speed test after the reboot and speeds were once again back to normal
today, I'm more convinced than ever that the 605L line has a serious software design flaw