Tomcat stopped logging

[Propes, Barry L]

Hello,
 
I have a strange situation.
 
Tomcat has stopped logging today on my prod. server. Not sure why. All of the 
app seems to be working just fine, but the key log file stopped generating new 
info.
 
I have a scheduled task stop and restart Tomcat every morning around 6am, so as 
to dump bad threads if there are any.
 
Usually it resumes just fine.
 
Any idea as to why this would occur?
 
Thanks!