Sorry, but its still an empyric explanation.
Using more than 10 smarthome modules (2000STW and 2001STW) since months without any trouble.
Discovered the strange behaviour already explained on the newsgroup about loosing X10 address.
It happened after defining a SCENE address on an appliance module (2001 STW) with a 1132 controller.
Everyhting worked well for 20 hours until the module become unreachable.
By using two ways functionaltiy, discovered that module Address was becomed A ??? (meaning that the unit was no more correctly sent).
Tried the reinitialisation procedure without success (adress one more time lost after less than one day).
The module is now recovered since 3 days by doing the following. Reinit procedure Assign address through micro switch, maxi controller on the same line. Assign same scene address than base address also with maxi controller.
Seems that something should be buggy in chips logic or quality of the signal during definition of primary and scene address is a key point.
Hope it helps
Thierry