We have similar problems till we upgrade from v10_SR3 to v11_SR1.
There were no problems with version 10, all tasks running without problems.
Now we have high CPU load, no server messages in the access point, suddenly faulty reloads.
After a restart the whole system, everything is ok.
Through our analyses you can see, that the "Handles" of the process "QVS.EXE" is increasing from day to day.
We think that this caused the high cpu load, the slow response, and the suddenly reload errors - till the server stops responding.
I checked all the configuration files and log files, but there is no bad configuration.
We came from V9 to V10 to V11.
I wish i could go back to version V10_SR5.