Home network has two Deco X20's with ethernet backhaul. Modem and master unit are in a hallway closet, ethernet over to a TP Link SG105E in the living room and the slave unit is connected to that swit

My Deco X20 I just purchased keep rebooting, in 1-2 hours, all units automatic rebooted 4-5 times...Contacted support using live chat and emails.... tried many suggestions, like changing the slaves to