My Garmin 2720 has recently developed a problem of losing its ability to "speak."
Switching the unit on normally and asking for it to provide directions to a given location, the unit begins performing normally. But after 5 to 10 minutes of normal operation, a spoken direction will be garbled, and then after that there is no sound at all.
Immediately switching the unit off and then on has no effect. Leaving the unit off for several hours will result in the pattern above where it works for a little while and then goes silent.
It sounds like the audio power amplifier is failing in the unit, it's kinda classic for an audio amplifier to fail when it gets hot, then work again when it cools down.
I'd suggest deleting the language you're using, then reload v7.2 firmware and the language. No reason why this should work, but it doesn't cost anything. If not you're looking at a $250 Garmin flat rate repair.
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Unfortunately, Fixya is not associated with Garmin. We can only answer device questions and can't speak for the company.
Unfortunately, the unit cannot be upgraded. Garmin provides both in and out of warranty repair service if the unit is having a problem. The 2720 sells for $49 on Amazon, so it probably is not worth your while to have fixed.
The 2720 is known to have issues unfortunately, it is pretty lowly rated on Amazon.
When updating the maps, you need to be registered with Garmin. All the numbers came with the unit. If you turn over your Garmin 2720, there will be a number flanked by "*". That is your unit ID. When you register, you must provide that ID. From the site, you can update your maps and you shouldn't need the 25digit key. It's programmed into your unit.
Check to see if "Recent Selections" contain any of your favorites. You can then rebuilt Favorites from the Recent Selections. If the Recent Selections contain any of your favorite just select it and then select Save.
Garmin normally replace your unit with a refurbished unit. Yes call Garmin and ask for a new unlock code. Normally they provide a new registration ID (yellow piece of paper with the unlock code for the latest mapsource map and accessories which it also included with the refurbished unit.
Mine just started doing the same thing. I took apart the speaker power cord, but don't see anything wrong with it. I thought I saw the unit turn off/on one time when I moved the cigarette plug back and forth, but as I said the wires are fine. I have the power cord apart right now and have 12 volts hooked up to the wires directly and the unit has been sitting here for 30 minutes without resetting.