I have a combination of 3 x M5 and 2 x M4 Decos setup in WiFi Router config mode using WBA/WPA2 with around 34 Devices connected generally all without issues except one.

This one device, a Samsung Tab A (2016), is able to consistently connect to my WiFi but about 75% of the time it connects without internet access to both the Main and Guest Wi-Fi whilst all other devices remain fully connected. No settings are changed between being connected and not connected on either the Deco system or the tablet. Furthermore, the tablet can be swapped without issue directly to my Wi-Fi router or my mobile hotspot (which is connected to the internet using my Deco Wi-Fi) at the time.

Is anybody able to suggest a reason and, preferably, a solution to this annoying problem please?