Soundstage there/gone/moves - poor current ????

Here is my problem. My system can have a huge soundstage which fills up half the room. Imaging is beautiful. Everything has its own place in space. The sound is comming from everywhere but the speakers. The problem is this just does not happen very often. One day it can sound very good and the next very bad. It can sound very good for several hours and then sound bad the next hour. I can listen and hear the soundstage change from good to bad or bad to good. I can hear the drums roll across the ceiling and 30 min. later it will roll across the floor. I have trouble shot everything. This will occur with all sources(CDP,TT,Tuner). It happens with 3 different amps, 3 different preamps, and 2 different speakers. My system is in the master bedroom. My question is has anyone had this kind of problem and what was done to fix this? Can poor current cause this problem? I am going to put in some dedicated lines with porter ports hoping this might clean this up. I have had some help and this was suggested. Even if it does not work it still will be a good investment.

Any suggestions would be appreciated,

Mark