Standard wireless routers by default can have 50 clients. Devices acquire IP addresses from the pool of available. Most times devices play nice with each other. As each devices connects to the router, it acquires whatever IP is given. Now, some devices don't play nice & some routers are too forgiving with a device asking for an IP it had previously but is already taken. So of course there is conflict & either one can't connect or 1 is booted off. Long story short: Go into the router and assign each device a static IP. Each time the devices connects, it will get the same IP because it is assigned. No conflicts. Give this a try. -- In God we trust; all others bring data!
My router supports 150 by default. If I said "253", would that be accurate for average by default?
Edit: To clarify: you can change it to a max above 50, but default is such. My bad for just showing the OP that by default his router would handle more than the clients he has.