GUI doesn't always recognise 3rd tuner!!

[Moonraker]

Hi all,
I have recently run a third cable from my quad lnb to tuner C on my premium twin +, A and B already working. Have set up tuner C the same as A and B, it works great, records 2 programs whilst watching a third, brilliant!!
But here's the thing! Every time I the box is put to standby, when I start watching again the box doesn't recognise tuner C, so I have to reboot the GUI and then it does recognise it?
Does anyone have the same problem, is that normal, or have I missed doing something? Any suggestions would be gratefully received! Thanks

[ccs]

When you say put to standby, do you mean standby or deep standby?