I have the 880 as well and I have had similar problems. I ended up having to adjust the delay between commands in order to get it to work. For some things I had to go to 2 seconds and some other as far as 5 seconds in order to allow time for everything to come up and be ready to accept commands.
BTW, if need be calling Logitech's phone support is not an unpleasant experience! I had some problems with my Mitsubishi Diamond DLP when I first got it. It was related to it being a brand new version of the TV and their data base wasn't quite right for the TV. The over the phone guy went straight into my config repaired the problem and then waited on the phone while I checked it out. The whole process from dialing to hanging up took about 10 minutes! I was thoroughly impressed.
_________________________
Emotiva XMC-1, Outlaw 7500, Sonus Faber Olympica III Fronts, SF Liuto Center, SF Surrounds, LFM-1 EX, Oppo BDP-103D, Apple TV (Gen. 4), Mitsubishi 65" Diamond DLP, Outlaw Cables, PS Audio Power Quintet, Duet and power cords.