Phone going into airplane mode automatically.


I have a Droid 2 Global and recently my phone started automatically switching into airplane mode when the screen times out or if I lock the screen. So, everytime I unlock my phone, I have to switch airplane mode off. It is really problematic because it prevents me from receiving texts or calls. This happened for the first time a week ago, so I did a factory reset which remedied the problem temporarily, but now it is occurring again. Id rather not have to go through the factory reset again, so are there any solutions that might will fix this? I haven't downloaded any strange applications, so I cannot figure out what the root of the problem is. Thanks for your advice in advance.