If you set a static (manual) IP address in the OPPO you need to make sure it is not within the range of addresses the router is told it can give out to other devices when they make DHCP requests. Otherwise you risk the router assigning the same address to some other device, too. Which causes problems.
There are two common ways to do this:
Either tell the router to associate a specific IP address with the MAC hardware address of the OPPO (in which case even a DHCP request from the OPPO will return that), or find the range of IP addresses the router is allowed to give out and pick one outside that. Typically there will be a setting in the DHCP part of the router which says it can give out addresses with the same prefix but differing in the final value within a range.
So if the router is allowed to use 192.168.1.2 through 192.168.1.100 for DHCP assignments then you can safely pick 192.168.1.150 for the manual setting in the OPPO and know the router itself will not also hand out that address to some other device.