Do you happen to have mapped network drives that are unreachable? I had a very similar issue with this: Intermittent freezes/not responding for up to 30s when selecting filters that use file paths and a mapped network drive is unreachable (Windows)
Do you happen to have mapped network drives that are unreachable? I had a very similar issue with this: Intermittent freezes/not responding for up to 30s when selecting filters that use file paths and a mapped network drive is unreachable (Windows)