ddlux can you describe how you are using EZSrve, Timers, Macros, Scenes, type of devices, Insteon or X10, etc. I will try to recreate something similar and see if the lock up can be reproduced. It might help in determining if it is related to usage or environmental.
Have you given any thought to using a mechanical timer of some sort to remove power from the EZSrve plug say once day at midnight to clear a potential lock up. Only a temporary work around but might help keep mission critical devices from becoming dormant.