Routing issues with cox?

Anyone know of something going on with Cox currently? We've had a number of customers report they can't get to us (AS 33260) from Cox (AS 22773). We've tried forcing traffic out different providers of ours and it usually seems to die with Level 3 in DFW, Time Warner Telecom in DFW, Cogent in Atlanta, AT&T in Atlanta, etc. On the Cox side, going on traceroute info from customers, it looks like they might force their outbound on Cogent because everything from them seems to come through that peer even though we prepend that one heavily. Thanks, David