Good, you're getting there.
I'd power off the box, then power it on again. If that doesn't fix it, then you might have to either have your dish re-aligned (try that first if you can reach it yourself - see below for a tip on how to 'test'), a software upgrade to whatever is doing the decoding (I don't think you said what...), or possibly (and maybe more likely than both of the above), a bigger dish, say 1.2M.
If the dish is reasonably accessible, you can try GENTLY flexing the dish by holding the very edge and 'twisting' it east/west a few millimeters, then up/down a few millimeters, while someone checks reception, or a signal on a meter.
0.8W or 1W? Very little difference, but if your reception is marginal, set up on a frequency that you most want, like K!osk!