I had this same problem recently. My problem was a little different S-Finder kept popping up OVER & OVER. It almost drove me Crazy. My phone was almost unusable. I am rooted so I froze S-finder with Rom Toolbox. After that every menu kept popping up in apps, browser etc. I believe it is moisture related. My problem started one night, I was running in the rain on the phone. The phone got wet but not soaked. I also took my battery out & set it in a bag of rice for about 12hrs, I had to work the next day. While I was at work the problem continued & then after about 4-6 hours it just quit & completely stopped. That made me believe it was moisture related. On the other hand I also installed about 15 game apps I was interested in the same night it got a lil wet. I figured I would try each one & the ones I didnt like I would uninstall. During that 4-6 hour period I uninstalled all 15 game apps, rebooted & almost immediately the menu key problem stopped. That made me believe it was an app causing it since it was still doing it after I got it out of the rice the next morning. Either way I feel 100% Moisture or an App could cause this problem. If you want to know if your Note 3 has been affected by moisture, open the back cover, remove the battery & stylus. Remove the 12 screws. & look at the 4-5 moisture pads to see if they are red. Hope this helps. Jason