All valueChanged events suddenly stopped working

I have a project which used many valueChanged events and worked well ,but today all valuechanged events suddenly stopped working due to some unknown reasons.I am using Ignition 7.7.5 , and I use valueChanged events like :
from org.apache.log4j import Logger
if currentValue.value == 1:
log = Logger.getLogger(“test”)
log.error(“test error”)
do somethins …
when I changed the tagvalue to 1,the scripts didn’t work,the value kept as 1.
After I restarted the ignition services ,everything worked well.
Anyone ever come across anything like that?

Did you ever figure this out, I’m having problems getting the valueChanged script to run unless I disable or reenable a tag. Thanks