Is there a bug related to inline power of 3550?

Hi:
We are using the inline-power function of some WS-C3550-24PWR-EMI to power on some aironet 1230 APs. There are less than 5 APs on one 3550 usually.
For unknown reason, those 3550s keep shutting down those FE interfaces connected by APs. We can do 'no shut' under the interface to re-enable the AP, however those interfaces will be shut down again after several days. We only see this problem on 3550 so far. Can anybody fell free to tell me what the reason is and how to fix it?
Sincerely,
cafershop1

Hi:
We are only using b/g. I checked the power level on a 3550 withou this problem, most of APs are using 4.4v.
Those switchs are running for a long time, I think around 2 or 3 years.
On the software side, we just enable inline power by the command of 'power inline auto' on the 3550. The IOS version for APs are 12.3(8)JA2 and switch are 12.1(22)EA8.
On the hardware side, all APs are plug into network jack on the wall and then connect to switches. The distances between APs to switches usually are less than 100 feet.
Sincerely,
cafershop1

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