I've had issues with the voicecoils on drivers even when they haven't separated from the spider. They had almost a dry rubbing sound and I could reproduce the sound at high or low volumes. I could also make the sound just pushing/pulling on the driver.

LFR1100
VP180HP
EP600
M3 In Ceiling x 4
M5OW
M2 - Atmos rears
ADA1500.5
M3 Outdoor Speakers
ADA 1000.8