Problems watching certain DTV channels, no signal

[kikemx]

I know nothing about Dish systems and I want to know if there is a fix to my problem:
I live down in Mexico and have a DTV system installed (US system) and during the year the channels I can watch varies, last year I watch perfectly OLN and this year I have no signal on that channel, I have more than half of the transponder with no signal. The best I can get in the ones I have signal id 55%.

Is there any LNB or power booster I can use?
I have a dual LNB and a Sony SAT A4 and a Sony Sat A55

Thank you

 

[silversurfer]

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