Sometimes the signal power gets weak on account of the direction of the dish antenna - which changes slightly on account of the elements. The angle of the dish would have to be re calibrated.

This is account of the wind, rain etc. All you have to do is cause the guy who fixed the dish and he'll re calibrated (reset the angle to the satellite ) for you.

I've done this twice - both the times after a dust storm.

Or maybe the Pehla guys have been visiting all terraces and causing the problems ;-)

All the best