Changed broadband provider could this have affected SNR?

Can't see how on earth this would make the slightest bit of difference, barring any electrical fault, and even this as an idea is far fetched. More likely a coincidence - maybe you should check your connections because if you have been moving stuff around at the back of the receiver you might have affected the feed from the satellite going in to the reciever.

SNR: signal noise ratio... in laymans terms the interference of the signal recieved by the lnb..
so unless you have a lot of wireless apparatus including a wireless telephone near the box connected to the lnb cable,,, doubt it..
its always a good idea to check your cable connections,quality ,etc... if it s quite old even change it for better quality..

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As SNR increases, BER decreases (good). As SNR decreases, BER increases (bad). What we have failed to realize is that as the SNR decreases, the number of errors and the rate of errors increases. The greater numbers of errors that result from lower SNR all have to be corrected or covered by the FEC (forward error correction) algorithms – the coding and decoding of the signal.

The greater the amount of errors that need to be corrected in a bit stream, the further from the original quality will be your end result. FEC corrects or ‘diminishes’, or hides errors to the best of its ability. For it to correct errors there needs to be enough good redundant information to replace or correct the corrupted bits. In the absence of all the right stuff, FEC uses its tricks and tools to interpolate (guess) the correct information from what’s left. The more errors you have means the more guessing the FEC has to do. Every guess is one step further from the best quality available.

There are two ways to affect the signal quality or SNR. The first way is to increase signal strength. The signal quality (SNR) will be increased and the BER greatly decreased, by even a small increase in the signal strength. The second way to increase signal quality is to reduce noise. Either of these actions will result in greater signal quality and better performance, but the “biggest bang for the buck” is increased signal strength.

Don't fall for the "as long as you have lock" mentality. First maximize your signal, then pay close attention to proper installation to further preserve the signal received. Every bit of noise injected by lack of grounding, poor connections, or improper materials, robs you of just a little more of the all important signal quality.

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