You didn't mention the WiFi model. From your description it sounds like you have reached a device count limitation either on your WiFi access point or internet router. An example of this sonocwall firewalls. They are limited at 5 unless their license is updated.
mmm - make/model of router - and who is your ISP (and if cable or "older copper/phone wire connection") - would be most helpful
Do NOT post any actual password details there though; that's the encryption key used to allow you to access via wifi. As long as you know what it is that's fine.. But make/model of router - please; and any other information you can offer too?
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