I bought this mattress twice in one year and I'm having the same problem that I had with the first one
The mattress loses air in the middle of the bed and leaves a dent I'm at a loss of what to do about this situation
I"m now out of 600$ and there isn't any insurance that comes with this product .Do anyone have any idea want I should do?

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This was our second purchase of (essentially) the same mattress. (Pump configuration changed, bladder connections improved in second mattress.)

First one: October, 2014, used 19 months. Second: May, 2016. used 9 months

Loved them, as far as comfort and functionality when first delivered, but they both began to lose pressure to the point that we had to replace them. Could find no leaks. (Didn't go to the extent of using soapy water--as recommended by the supplier--just too much to deal with.) When the second mattress began to lose pressure, I replaced all but 1 LAL bladder in the second with non-LAL bladders from the first, which seemed to help for a while.

To get the benefit of the LAL attribute of the mattress, you must minimize coverings between the mattress and the patient, and not use ordinary disposable waterproof pads or waterproof mattress pads. (LAL compatible pads are available, but more expensive.) A consideration if incontinence is an issue.

FWIW: Now we have the Drive Medical Quick'n Easy comfort Mattress with an "Alternating pressure Mattress" by Vive on top. Too soon to rate those items, but differences noted so far are: The Vive pump is FAR quieter than the Med Aire LAL pump; Vive has no "static" mode, so always "non-linear bumps and valleys", which makes it harder to move the patient (The Med Aire mattress, because of the flat cover, static mode, and linear bladders is much easier to slide the patient on, easier to work on,) With the Vive on top of the "Quick'n Easy" we no longer worry about a power outage. (Recent storms have caused a couple outages. NOTE that the Q'nE supply hose has a cap that can by used to reduce air loss when the pump in not operating. Didn't find that in the manual! Found out when I inquired about a suitable back-up power supply.) Vive has no easy disconnect in the air supply tubing between pump and mattress--just bayonet fittings on pump and mattress, so if you need to reroute the tubing or separate them for any reason, it could be difficult. The Med Aire mattress has an easy disconnect at the pump end of the tubing.
UPDATE: about 2 years later:
Replacement mattress is working well. Easy fix to moving patient on "lumpy mattress": just disconnect hoses from pump! Initially, I was worried that the connection would be loosened and fail, but finally decided to try it, figuring that I could always cut 1/2 an inch off the end to renew it. After many months, no problem.

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Incredibly easy to set up. Everything comes in a single box which isn't heavy at all.

Works well.

Whatever you do, choose a mattress with "low air loss" -- do not buy a mattress that ONLY offers alternating pressure!
There is good evidence from studies that "low air loss" mattresses help prevent and heal bed sores, but no good evidence for alternating pressure.
This one has both. you can disable the alternating pressure if you like)

The low air loss on this mattress is CONTINUOUS, which is a good thing!

Some other mattresses (such as several from invacare) have low air loss that is only "on demand" -- you have to push a button which then only activates it for perhaps 20 minutes. I believe continuous low air loss is sure to work more effectively.

The noise is perhaps twice as loud as a big aquarium pump. I found I could eliminate much of the noise if I paid careful attention to the hose connector where it plugs into the pump, a slight gap will makes a loud hissing noise. Press it in well, or tie it if you have to, and no problem. There also are some vibrations generated that propagate through the bed frame, but aren't felt by the patient unless they lean on a rail.
If you had absolutely no other noise generating devices you still might be annoyed by it, but I'm managing to sleep fine in the same room.

What is low air loss? There are zillions of tiny holes on the mattress constantly emitting small amounts of air, which prevents and heals bed sores by keeping skin cool and dry.

In order for a low air loss mattress to effectively prevent bed sores, you need to minimize the amount of material between the patient and mattress!
That means ideally a thin cotton sheet only, or even no sheet and only underpad if there is an existing sore. I'm also using a thin disposable bed pad, and looking to buy a variety specially designed to breathe well for this purpose. Update: Am using kendall "maxiflo", specially designed for low air loss matresses -- good results.

In the event of a power outage, the mattress would eventually deflate creating an uncomfortable and unsafe surface, so that's something to think about.
It'd probably be ok for a bit, but I have a foam mattress I can swap in if we get stuck with a long outage. Haven't been through it yet.
Update: I bought a yamaha 2000 backup generator converted to run on propane, enough to keep refrigerator going too.

Other recommendations for bed sore prevention: Baza Perineal Lotion after regular changes (moisture barrier). Sage "prevalon" heel protector (heel & tailbone are 2 most common bed sores)
For bed sore treatment: xenaderm ointment (prescription only). Keep pressure off, regular turns every 2 hours, cool & dry.
Low air loss is no substitute for regular turns but does really help

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excellent product and eliminates bed sores