Last night I noticed something new.. right after switching channels, I'd get the blue pop up at the bottom right (like we see for the 771 message) but it would just say "Please wait". It would go off after approx. 2 seconds. The picture and sound would be there fine, but this little pop up came up when switching b/w various channels.. such as 731, 623, etc. Some are HD, some are SD. Didn't see any signal strength issues. Anyone else see this issue last night?