I am having issues with the throughput of my deco on an cat7 cable with 2 switches. Fore some issue it slows down my speed tot 100 mbit I had to plug it in directly in my modem/router to solve this is

I have a Rogers gigabit ignite modem in bridge mode, connected to main Deco M4. When I connect ethernet to 2nd port of Deco through a gigabit Tp-Link switch to another device it's slow - like 25-40mb/