Help suggestion needed channels skipping

I am facing strange problem on my both tata sky hd connection. I am not geeting signal on channel 348 zee studio 349 WB 250 Tlc hd world animal planet hd world star sports hd3 and also star sports hd 4 star movies selct hd these channel show no sigal and quality also show zero. I am geting star plus hd colors hd and all other channel they show good Signal a strength 157 quality above 60. thrice I call cc and service engineer visit they say it's a rare case happen 1000 in 1 they said they increase that one tp strength from the lnb which also giving problem.But all in vain it works for one or two days then again same problem arise. what should I do now I have mukti connection both givibg same problem.
 

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no it's clear sky and since yesterday I am not getting signal particulary those channels I have mentioned. I have sat cr lnb so one tv is on lnb and otheris on sat cr
 
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