Question on signal drop

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http://forum.xda-developers.com – . I noticed that while my phone ( today.. ) was sitting on the desk next to me, the signal drops. Im on 4g no problem , full signal on Eclipse CDMA rom. I have an xt912 model. Its weird, the signal will drop from blue 4g, to gray full signal no 3g or 4g. Then in about 15 seconds the 4g icon will pop back up. And while it looses the 4g icon, the screen turns on and then turns off once it connects again. Any idea on whats going on? (HowTos)