Problem with NR5103EV2 device

Model Name NR5103EV2 Firmware Version V1.00(ACIR.1)C0

With it, there’s the following problem, with the following symtomatics.

For example, there was a network on LAN 192.168.1.0/24 addresses of Router 192.168.1.1 , on WAN Cellular Hung address 192.168.1.2 (what is it? start problems. packet loss.)

change to LAN on 172.26.100.0/24 Router address 172.26.100.1 , starts working normally. We overload Rower . and on WAN Cellular already hangs address 172.26.100.2 again problems. There will be screenshots, there are other networks , but the problem is repeated , on WAN interface is set ip address from LAN network, the problem is reproduced .

It was, Normal. Reboot. We get this result.

Please help with this device