|I would start by resetting the router to factory defaults. Search the manufacturers website for the manual and follow it's directions on how to reset. Then, once it's reset, you should be able to connect to it and configure it without issue. |
If it still loses connectivity I would try to quickly update the firmware on the router. But be warned, if the router loses connection or power during the process, it can permanently damange the unit and render it useless. Typically the firmware upgrade process takes less than 3 minutes so you should have plenty of time to upgrade it.
If a firmware upgrade doesn't fix the issue, the unit is no good and I would toss it out.
just FYI, Cat6 and Cat5/5e are all capable of 1000 Mbps (Gigabit) so six isn't actually "faster" than 5/5e
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.