I'm not clear what the configuration is here. Is this an HA Oracle system or an Oracle RAC system. It should be the latter, but you said HA not RAC.
There have been a number of bugs with Oracle 10.2.0.x and gsd. As of 10.2.0.3 our investigation is still on-going as to whether they have all been resolved. (though we are hopeful). So, you may want to make sure you have all the Oracle patches in place.
Tim
You need to log into Oracle metalink assuming you have a support contract, etc. My colleague informs me that there are already 147 patches for 10.2.0.3, so it might be an idea to try upgrading to the latest patch set and see if that cures the GSD issue. Unfortunately, I can't offer a better suggestion than that.
Tim