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i have an astro that is about 3 years old and recently purchased my son a astro 320 t5 combo. i was wondering why the older one wont find the collar? i have it updated. i was able to add the collar but when i turned it on to track it the other morning it wouldn't find it all day long. dont think i tracked it once. the astro in the combo picks it up and tracks fine. just wondering if anyone had this problem before or know what the problem is.

Sounds like the update didn't take right, I would check the software version on the old unit and make sure the software is correct.

I think it's in the about section of the system.