You guys crack me up! I can't believe so many of you haven't a clue what an elliptical orbit is. OK, listen up. The satellite is following the immutable laws of physics. It's doing exactly what it was doing when the Briz-M upper stage pooped out; it's following a highly elliptical orbit. This means that it whips around the earth at low altitude, but loiters over the earth at high altitude. It's not about to crash into the earth since it's perigee is something like 500 miles. (The perigee is the point of closest approach to the earth.) If the engineers do nothing, the satellite will keep orbiting like this for decades.
You can't look at the altitude at the same time every day and determine much, since this particular elliptical orbit is nowhere near geosynchronous. By that I mean it's period is not 24 hrs.
Now, if you went
here it sure would be nice to see the ephemeredes of this satellite. That would tell us the apogee, perigee, period, and inclination of the orbit, and we could see when ground controllers fire their thrusters. But unfortunately, the link above shows all zeros for these numbers, making it entirely useless, at least for now.