It is the Thomson DCM 425. The software version is
Software Version: ST52.08.31
Not sure if that is what you mean't by STAC.
But that's the thing, the old modem was an incompatible firmware but with the new compatible modem, the symptoms of the problem, including times the connection goes down, are virtually identical. Perhaps with the new modem the issues are a little less pronounced, but it's hard to actually notice much if any of a difference the new modem makes. The only thing the new modem did was cut down on the daytime disconnects a bit, the night time issues are exactly the same in their timing, symptoms, length connection goes down, and severity.
Anyways thanks for replying to me! Any and all information or theories are appreciated.