I bought my phone in July 2011. A few weeks ago, two of the native apps, Text messages and making calls, stopped functioning normally. When I hit the "Phone" key on the home screen, it no longer brought up a menu with recent calls and a keypad. Instead, a tiny gray box would pop up that said "phone". The contact names in my text messages, even though all these people were in my contacts, also disappeared. I tried restarting my phone, and removed the battery as well. However, neither of these issues were resolved. I downloaded an app to make calls, and that worked fine. However, I didn't like the interface and resorted to restoring my phone to factory settings (very annoying).
Now, a week or two later, the alarm/world clock app has stopped working. When I click on the clock on the home screen, it used to bring up the app for the alarm/world clock / stopwatch. This stopped working, so I resorted to downloading an Alarm app from marketplace.
I woke up this morning and saw that the native mail client would not refresh my emails even though I manually refreshed the emails. The last email I received was at 2:00am. Not sure what happened between then and when I woke up at 6. The only account I am linked to is Gmail. I am really frustrated with this phone...WHAT IS GOING ON? I haven't downloaded any apps in the past few days, so I don't think I ruined my phone by downloading any viruses. I also use the Lookout App, which claims that everything on my phone is fine. I REALLY don't want to do another factory reset....because the way things look this is becoming an issue every few weeks.