AIR-LAP-1142N-E-K9 unexpected power offs

Hi we have two seperate Cisco wireless networks both based around the same infrastructure.
Cisco 5508 WLC/s running 7.4.100 Firmware in our datacentre, with AIR-LAP-1142N-E-K9 LAPS distributed at site offices.
This infrastructure has been running well until recently when we have had a spate of the LAPS appearing to power off.
The LAP appears to be off with no LED status light as if it has been powered off, but the power supplies are still connected and the LAPS are often warm to the touch as if drawing power even when they have been "off" for a couple of days.
Unplugging the power supply (at the LAP) and re-applying brings the LAP back on.
The LAPS involved all used the recommended Cisco manufactured power supplies as there was no POE/power injector infrastructure.
The LAPS vanish from the WLC as if disconnected, without any apparent errors in the WLC logs.
There are no crash logs for the LAPS which have powered off.
Console output from a LAP which has powered off on startup just shows the AP coming back from a "cold start".
LAPS operate normally after restart, but after avariable period, typically 2-7 days will power off again.
This is happening across multiple sites, to LAPS connected to different WLCs.
Has anyone seen this issue before?

The LAP appears to be off with no LED status light as if it has been powered off, but the power supplies are still connected and the LAPS are often warm to the touch as if drawing power even when they have been "off" for a couple of days.
Gareth,
Just want to make sure you are using a power brick/power injector.  Can you please confirm?
Had issues with 7.4 when I noticed that some of my APs, running in PoE, would suddenly get "lost".  They would suddenly reboot and they wouldn't negotiate PoE properly.  I had to manually shut down the ports for at least 5 seconds.  If I don't leave it off for that long the APs simply won't boot up.
Ever since I've moved to 7.5, I haven't seen this happen.
There is a well-known bug, can't seem to find it, about 1140 and WLC firmware 7.4.  If I remembered correctly, the bug describes what you are seeing.
You may want investigate in using 7.5.

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    ==================================================================================
    Cisco IOS Software, C1140 Software (C1140-K9W8-M), Version 12.4(23c)JA3, RELEASE SOFTWARE (fc1)
    Technical Support: http://www.cisco.com/techsupport
    Copyright (c) 1986-2011 by Cisco Systems, Inc.
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    This product contains cryptographic features and is subject to United
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    third-party authority to import, export, distribute or use encryption.
    Importers, exporters, distributors and users are responsible for
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    Part Number                          : 73-12836-03
    PCA Assembly Number                  : 800-33767-03
    PCA Revision Number                  : A0
    PCB Serial Number                    : FOC15443W5A
    Top Assembly Part Number             : 800-33775-02
    Top Assembly Serial Number           : FCZ1548W0GJ
    Top Revision Number                  : A0
    Product/Model Number                 : AIR-LAP1142N-E-K9  
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    ==================================================================================
    NAME: "AP1140", DESCR: "Cisco Aironet 1140 Series (IEEE 802.11n) Access Point"
    PID: AIR-LAP1142N-E-K9
    Message was edited by: Jeroen

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