Network set up question

[skysurfer 76]

Greetings. 

I purchased motorized TQ from "Cockpit For You". This TQ required internet connection. My modem with integrated router (Arris G36) is in another room and my PC is connected via long cable to the modem. Internet speed is fast. To connect my TQ I bought Linksys SE3005 switch and connected Ethernet cable thru that switch, and then I split two cables to PC and TQ. The TQ GUI shows its own IP address now. I read the router provides a separate IP address for a separate device. So, with this setup the TQ does not work as expected, it reacts with heavy delay. If I connect this TQ directly to the modem, it works as expected. I tried another switch with different cables, same issue. Currently the only way I can make this TQ to work is if connect it directly to the modem. However, if I keep this setup, I need to buy 50+ ft long cable and drag it across the whole how. I don't want to do this. I am wondering, if I add a separate router instead of a switch will make a difference. My network set up is shown in the image below. 

Thanks for looking. 

[skysurfer 76]

Solved by replacing a switch with an additional router.