BBM message saying Read but not even delivered.

I sent a BBM msg(From my Z10) to a friend who is on android. Strange enough it shows "Read" for me. But he did not even receive it. Frequency of occurrence is sporadic. With the same friend it happened again when both of us were hooked to the same wifi. First message said delivered, but he showed his device that he hasn't received it. I sent another msg, which he received. But the previous msg I sent never got delivered. However when he checked my second msg which he received. The undelivered msg turned to "Read" in my device. Is this a known issue? Anybody else facing the same? Any help is appreciated..!

Z10

Z10

Never experienced this with my Android friends. I'd suggest your friend uninstall and then re-install BBM.