I'd be interested to find out what the issue is myself here. Mine (bought s/h) has exactly the same issue. Did post about this ages ago but haven't been using the modular much.
My Wasp was working fine, had it out of the case for a while and on putting it back in got exactly those symptoms. I've tried swapping the CD4069, the CA3080 and even the 5532 with no change at all. Examining the board shows no obvious shorts / damage / solder bridges or dry joints.
Steve