If you have a slimeline-5, then you will get the message if you are tuned to a channel on the 103 satellite and you have lost the signal from the 119 satellite. The best workaround I have found is to tune to a SD channel (I used DIY Network) before you turn off your receiver. That way, while you are not actually watching anything, your receiver is getting the guide data from the 101 satellite.
The two long term fixes are to realign the dish if that will help to get the signal from 119 or to switch the LNB to a slimeline-3, which always gets the guide data from 101. I had neighbors trees blocking my view to 119, but since I am on the East Coast and do not care about Spanish Language programming, I had no need for 119. I replaced my slimeline- with a slimeline-3 and have not had any problems since.