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Your IT person is an idiot. The IP address of the devices or the WiFi modem are irrelevant.
What matters are the SSID name of the WiFi, and the MAC addresses of all devices involved... neither of which are changing any time soon (MAC addresses are part of the network hardware of all devices).
If it's not signal strength, then it's signal noise.
If you have an Android phone download the app called Wifi Analyzer. It will show all of the WiFi in the vicinity and which channels they are using. typically for 2.4g you'll see BT equipment on channels 1 and 11, Talk Talk on channel 9, and for 5g most equipment defaults to channel 36.
Using that you'll be able to look at it, find a space in the channels where very little other equipment is broadcasting, and configure your equipment to use that channel.
Most home equipment defaults to one of two channels, most small office equipment (Ubiquiti stuff) defaults to the most empty channel when the system starts up, most large office equipment (Cisco) will constantly roam the empty channels on 2 transceivers to avoid dropping people when they move.
If you've bought home equipment, manually configure it.
If you've bought small office equipment, you're probably fine and it's signal strength that is the issue.
You haven't bought large office equipment, but wouldn't need to care about it.
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Velocio
@ChainBreaker
I'm not sure where to put this, but I guess this is the closest.
I am trying to sort out my WiFi continually dropping. I bought a new modem/router. A beast that has upped my download speeds from 13 to 74.
I never had, or at least didnt notice any dropping in the last setup. This does. Its now got 5g as well, which is new so cant comment on 'previously'.
IT person suggested giving a dedicated IP addresses to the attached devices using their MAC addresses as they think that they may be trying to share the same connections. I have managed to work out how. But I learnt that mobiles may get new IPs everytime they reconnect to the router. How do i make sure it sticks to one IP while on my LAN?
A link so i can learn should be sufficient (I hope)
cheers