I have used an AC68U for 5 years with no problem but unfortunately upgraded to the higher port RT-AC88U 6 months ago and have noticed it appears to be unstable on its Lan C0nnections. When one examines the network the number of devices connected flashes and the LAN connections are shown to be intermittent- flashing off and on. The actual connection to the lans does not reflect this so it has not bothered me unduly until recently I lost total connection to one lan device. in total. I rebooted innumerable times to no avail and checked lan cables but it was n't until I changed the port that I managed to get a connection and then became aware of the classic port 5-8 problem associated with these routers. I decided to try unplugging and rebooting and found I did have connection on port 6 so it does not appear to necessarily that problem. The router has been stable ever since unplugging days ago but the flashing of network devices continues and I am just waiting to loose connectionon a lan connected device again. Apart from this the router appears to function fine but I expect more from ASUS. I am tempted to upgrade to an AX but question if they perform any better? Is this weakness resolved in AX or do I need to purchase another manufacturers router. I have always run Merlin but don't think it has anything to do with the problem. I have not tried a factory reset. Should I or is this behavior an accepted weakness.