malfunction of invisible collar

I have a guardian brand invisible fence all over my property. It was working fine. Recently i started noticing that my dog leaves the zone , though it keeps beeping when the dog is near the fence and the dog is not bothered. I feel it is not doing its job. I changed the collar and put a new collar with another transmitter from my other dog and it doe not bother still. Does dogs get used to this and start ignoring the unit? or is something else. I tried tightening the collar and cutting some hair of teh neck, too. Any suggestions?
Steve
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call the fence company. they might help
the collar can be set to different settings. the best thing to do is contact the installer
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