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Check your batteries. Transmitting (Tx) takes more power than Receiving (Rx). Also, check to see if you have the Qt filter turned on, if so, turn it and all other special features off (zero) and try using the radios in a very basic mode. If you cannot Tx or Rx with good batteries, and all special features turned off, you have a problem with one of the radios.
Your radio is possible stuck in transmit, or has an internal issue. If you can get it into programming mode, check your programming. Also you might try trading the battery with a known good unit to see if it is simply a battery issue.
Here's a link to the user guide: http://shop.giantintl.com/Manuals.asp Choose your model from the pulldown.
Take the radios back to a very basic setting with all special features turned off. If the radios have a Qt filter check to see it is turned off, and set your Code to zero (off) on both units. Also, check to see your battery is good in both units. Trade the battery with a known good radio to see if the problem moves to the other radio, is a simple test.
The radio is not turning off completely. It is possibly a bad on/off, or it could be another button is slightly stuck and when turning the unit off it is trying to do another of the multi-button pressed functions. The on/off/volume potentiometer is a common failure item on most 2-way radios. Repeated use or dirt/dust/debris can cause it to fail. Do not use any solvents or cleaners. The best method of cleaning would be canned air. If you cannot find the way to clear the issue, your best option is to remove the batteries when not in use.
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