We have approximately 30 SPA525G and 504 phones deployed at a customer site. Experiencing a number of issues with the phones locking up during a call. The display is still lit and call appears to be active (timer) but the call is disconnected and then do dial tone. The only way to get the phones back up is to reboot them.
Firmware on phones:
525 = 7.2.5
504 = 7.3.7
Sho ephone phone-load shows a number of Cold+DhcpFailed
Phones are connected to UC520 and ESW switches.
System image file is "flash:uc500-advipservicesk9-mz.124-22.YB4
TAC case just opened as well.