Need some help here...

I have a Skystar USB2 and untill about 3 weeks ago worked great, I now have a few problems,
On W3 10928 I have a signal of 91% but it wont lock, Is that frequency still sending data ?, if so does anyone know what causes the out of lock senario. I have good signals from 10845 and 11262 and these lock no problem but as for 11351 I have a signal but can not get a lock

I have checked and double checked the pol and sr

I have downloaded the skystar 2 repair file, but i think this is maybe only for pc card and not usb box, so not used it yet

any info appreciated