The problem was not solved at all.
Few things I understand is that:
The ONR (Optical Network Router) have 4 ethernet ports and does not have wifi capability, and another router AP (acting as a bridge) with 4 more ethernet ports and does have wifi capability.
Two devices have their own DHCP server because they could take on incoming devices.
There is no way to disable DHCP on the ONR.
I have more than 255 devices and I can't configure the subnet mask into 255.255.254.0, reason being that the firmware was hard-coded for 24 bits.
Is there any other way I can attempt on solutions that could keep intermittent issues at bay for now?
It's affecting my printing and internet surfing for work.
Connecting another router will have the ONR assign 192.168.2.1 to it, and anything that is connected onto this network cannot talk to devices in 192.168.1.1~254 range.
I have an expert with me and he also faced a lot of limitations centering the ONR.
Just hoping for someone to dish out a sound opinion and hopefully, a good solution to it.