hi rato,which firmware are you using with the humax,the 1.07 firmware?
i've been finding lately if i press power off on the remote,then press power on,quite a few times the unit will no longer come back on,and just says "stand by" on the front display.
And i'm having to do as you described ,switching the box back off then back on at the back,it might be the firmware,i've gone back to firmware 1.04 just to check if that makes a difference.
The channel i'd be on would be a free view channel rather than tps,didn't make sense to me why it did this sometimes,but not all the time,so far it's not been having the same problem with the 1.04 firmware since yesterday.