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I have a 536i expansion module attached to a 57i-CT. The BLF lights on the 536i will light up and work fine for a while... however after a bit they seem to loose their ability to see if someone is on a phone. They still work to dial, if I try to dial, however, they don't light up when someone makes a call, or if their phone rings. If I reboot the phone, the lights start working again