the last couple days when I go use my MX-780 for the first time after I press an activity it reboots, I get the URC screen than it displays MX-780. I just went to start watching a blu-ray so I pressed the button which executes the macro and it just reboot sort of. I pressed it again and it did nothing. Any ideas?

Batteries?

Exactly. I put some Kodak batteries in about 2 weeks ago. They fit very loose, you could hear a slight rattle when you picked it up. The batteries still had juice left too. I put in Energizers last night, no rattle, they fit as usual and no reboots.

"Aaa-haaaa! The old rattling battery trick!"