Anyone have this issue with their Panny 42PX75U or similar?

I bought my 42PX75U new last in July/August (2007). Everything had been working great until a couple hours ago. The TV seemingly is having issues processing IR signals from the remote. I first noticed this when I pressed the "All On" button on my DVR remote. The TV didn't turn on so I tried to turn it on separately, which didn't work either. I then tried the dedicated TV remote and that didn't work. I ended up having to turn the TV on manually with the button on the panel. Now it seems that the TV will respond to the remotes maybe 2' - 3' away, but no farther. At the "threshold" distance where the TV stops responding, it seems to lag a little, where I might press a button and it takes an extra second to register on the TV. For example, if I press the volume button five times, it will go up or down five times but not quickly or evenly. I replaced the batteries in the remotes but the problem still exists.

Has anyone on here had a similar issue with their Panasonic plasma?

Edit: Also, I disconnected the power for a couple minutes but the issue is still there.

I'll go out and buy some new batteries later today and try those.

Regarding the CFL lamps, I have been using them since before the TV was bought and it never had problems before. I hope it's just a huge coincidence that all the batteries in my remotes got weak overnight. The DVR still responds just as well though.