alzhao
2
Sorry waht is this? Can you explain more?
First, you can try op24 firmware GL.iNet download center
Whatever the reason, this op24 firmware should be better.
Second for your subnet confict I am not sure what you mean. Should just be as simple as changing a subnet without causing problems.
The router's LAN IP is 192.168.8.1 by default. Did you change this one?