The problem that the original poster described is nothing to do with groundspeed mini and is refferred to in documentation as 'autothrust misbehaviour'. It only ever effected the A319 and was cured (allegedly) when the FMCG S7 update was introduced.
As a result its very difficult to find reference to it in any current documentation. All I can find at the moment from some old stuff I have on a disk is a comparison chart as to which of our fleet suffered from various OEB items and Autothrust Misbehaviour is listed as ATA 22 against all our 319s.