IOC PVs intermittently flicker between values and LINK INVALID

["Tran, Phi Dung via Tech-talk" <tech-talk@aps.anl.gov>]

Hello Tech-Talk,

I’m running into an issue where one of my IOCs behaves normally after a reboot, but after several days of uptime all PVs begin to flicker — they alternate between their correct values and LINK INVALID.

Some details:

• Rebooting the IOC clears the issue temporarily, but the flickering returns after a few days.
• This affects all PVs in the IOC, not just specific ones.
• I’ve observed the problem using camonitor as well as in client GUIs (CS-Studio).

Please advise thank you,

Alex