The app 601 error reset message can mean a botched app install. Did you recently install any apps? If so, uninstall and do a battery pull. If you added more than one, you can try adding them back one at a time. I wouldn't worry about hacking. It's probably just something that didn't install right, but it doesn't necessarily mean the app is bad.
Here's something you can try if you ever have problems getting e-mails: Go to Options > Advanced > Host Routing Table, press the menu key and select Register. Go to Setup > Email, select the e-mail account and resend your service books.