I've noticed spectrumgtw 8.65 probe is taking around 25 GB of disk space. It seems too much to me and I would like to verify whether this is a normal behaviour or not. I've looked for it in your KB and found a thread talking about a similar issue:
Debug folder size is 12 GB and contains around 200K files. Cache folder size is around 13 GB and contains around 188K files.
Release : UIM 8.51
Component : UIM - SPECTRUMGTW 8.6.5