More than once, all four windows (and one time, the sunroof flap) have opened halfway by themselves. My wife parked it at church a few days ago, came back an hour later and discovered this disconcerting problem. And it happened again last night in our driveway. Any thoughts?

 

if you hold the unlock button down on the key fob, it will open the windows and in your case, sunroof. make sure it's not in a place where it can get jiggled, smashed and otherwise not treated very well...or maybe you have a ghost

 

Any chance of pressing the remote buttons on the key while it's in a pocket or purse?

If you press & hold the unlock button, it'll roll down the windows and/or sunroof.

 

The windows and moonroof opened is usually due to the unlock button on the remote being inadvertently pressed. There's been similar reports in the previous generation Accords too (i.e., windows applicable to 7th (2003 - 2007) and windows and moonroof applicable to 8th (2008 - 2012) generation Accords too). This was noted in Honda technical literature before.

 

Thanks, all! Guess I should have read the manual.