It's LNB issue....is it a new installation like installed few months ago or old installation? in June I bought a new connection.last month i also found signal quality part is 1 bar or max 2 bar... technician also tried with all angles no change ...finally he found lnb needs to be replaced. After replacing i am getting like 70% signal quality. Technician said the person who installed the dish had actually fitted a old used lnb and hence the issue... Make sure to check this.