The thing i have found with cheap DISEqC switches is they have a tendency to play up. The first cheap one i bought worked fine with the cheepo lnbs i'd purchased of ebay. When i started getting more seriously into the hobby i started spending more money on better kit.
I purchased 3 Mti Blueline lnbs, which at the time were classed as one of the better lnbs to have. These lnbs caused me all sorts of problems, so i canned them and went back to the cheaper ones and Analoguesat got 3 lnbs for the price of a pint of Banks's beer
It later turned out there was nothing wrong with the lnbs and as far as i am aware Analoguesat is still using them today on the 8 way EMP DISEqC switch i sold him.
It was the cheap and nasty DISEqC switch that was causing the issue as it just wouldn't work with the more expensive lnbs. Once it had switched to a port with an MTI lnb on it, it locked that port and wouldn't release it until the box had been rebooted.
If you want it to workm spend a bit more money and do it right the first time.
Nano