Anyone have issues with the 450i 900mhz SMs droping connecction from their AP? 15.0.3 firmware on AP and SMs.
Why are you using such an old release? The very first thing I would do would be to step up to 15.1.
Also, you're going to have to give more information. There's just not enough here to help you with this issue.
Is it just one SM's, or all the SM's on an AP... is this happening to multiple AP's? Have you done any troubleshooting like running an SA on the AP and SM's? Perhaps using a different channel or channel width?