I have a 5 Deco network in a 4 level building (basement, L0, L1 and L2. The router is in level 0 (L0). Level 1 and Level Basement are connected to L0. L2 is connected to L1. When a device is between L1 and L2 there is malfunction of the network and it cannot connect to wifi. When I connect L2 to L0 ( with weaker signal connection) the network is working properly. Can you help me find the problem?