Airport extreme 4th generation - self-assigned IP address

2 Airport extreme 4th generation with latest firmware. extented network in bridge mode.
After switching providers, I reset both my airports and set them up new accordingto manual.
Only some devices (less than 50!) at times can't get an IP address.
Error msg: Airport has a self-assigned IP address .......... and will not be able to connect to the internet.
My new provider told me it is an internal probem. Quote: This is an internal issue between your devices and your internal routers. we only gives an address to your router and it is your router that gives your devices an address.
My question is, which part of the manual settings in Airport Utility affect the distribution of internal IP addresses?
or how to change my set-up to avoid the problem I'm experiencing?
thanks a lot.

When in brigde mode your provider has to supply at least one IP address for each devices you want to connect.
Alt. turn bridge mode off in Airport Utilities and let your Base station distribute IP addresses. For that you have to enter two DNS addresses.
HTH.

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