Trouble connecting to AT&T Uverse routers

We have had 3 instances in as many days of clients having trouble connecting via wifi to AT&T Uverse routers.  The computers tend to connect everywhere else and, after manually releasing and renewing their IP addresses will connect to the AT&T Uverse routers but it’s odd that it has only happened now.  I am curious to hear from anyone else out there that may be having the same problem or possibly even from any AT&T sources (you can remain anonymous, if you like) that may know what’s going on.  Again, this seems specific to AT&T Uverse routers and is affecting computers that a) had were connecting just fine before and b) can connect fine to non-AT&T Uverse wireless access points / routers.