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It is amazing how quickly time flies, found this post almost a year later. Ironically i am running into this issue again, with my wireless controllers now on IOS-XE 17.12.05. Not sure if anyone else has had the same on this version. Going to open up ...
We actually ended up finding out the issue, which was completely unrelated to the APs or WLCs. The actual issue ended up being a misconfigured QoS setting at one of our larger sites that was sending almost all of our traffic in the Network Management...
I am seeing the same issue. Previously had the controllers running on version 17.9.4. Problem with that is one of the "Known fixed releases" includes 17.9.5, which I recently upgraded to, but am still seeing the same behavior.
For what it is worth, I want to agree with what Marvin is saying. While I have never gone into the shell within ISE, I have in Prime to extend the number of lines in a report before it truncates. In doing so I accidentally added a space into the file...