Blind Scan

[chewie]

Hello Guys
I have this little problem with my VU+, is been there since I got the box or maybe is my set up. I have orthomode feeds on my dish and the problem is that sometimes when I blind scan it does not pick any transponders or just a few, I have to switch the unit off using the off/on switch on back of the box, power it back up than it works fine I can scan a few Sats and than it craps out, here is a picture of my tuner A settings.
Open for suggestions.
Thanks in advance.
Chewie.