just how many log files are you deleting?
I had a similar problem a few years ago. Meet got to the exact cause, but restructuring the application to require less screen changing appeared to help a lot.
This app had a few trends as well as alarming & parameter files. Best practice was to reduce the no of screens required to be changed regularly, as each time one was changed, it added to the memory.
We have since added a SCADA to the site, & as far as I am aware, this problem had not happened since, or at least in a long time. The screens are still used, but not as much.
Can u monitor how the operators are using the screens, to see if there is a pattern or something that you can improve?
I know this is a band-aid, but is a limitation of these units I think.
I have 14 screens total and the operator only goes to about four. Most of the time the operator is on a Main Screen. This is a very simple application.