AC68U problem

[bigdemon]

Hello, I am having some connection issue with my AC68U ever since I had the newest firmware, any input is welcoming. Basically I have to restart the router very frequently to get devices to be able to connect, every a couple hours all the devices are kicked out? Currently it (LAN port 1) is connected to my DSL modem (ISP is TDS fiber, coming with Actiontec V1000H modem router) LAN port 1 in AP mode, seems this port 1 to port 1 connection is suggested in AP mode. I also tried regular router mode/AP mode using WAN port to LAN port 1 of DSL modem, pretty much same issue of forced restart to get back connection although SSID is broadcasting. Maybe I should give Merlin a try but it used to work ok...