If it isn't crashing, there won't be any automatic logs created, but you can manually create process snapshots when it is unresponsive, and send those to us:
Detail on what is being done when the freeze happens would help work out the cause. (For example, are you changing folders when it happens?)
A default config is worth trying in case it's something in your toolbars or other settings. (Settings > Backup & Restore to backup your current config so you can go back to it later. Then uninstall Opus, reboot, and reinstall it. You'll then be on the default config.)
Unavailable network drives that are either mapped to drive letters or referenced in things like toolbar icons or favorites are often the cause of 30+ second delays.
Delays can also be caused by things outside Opus, like shell extensions and antivirus, or in some cases tools with mess with other programs' windows/borders and aren't written to deal with multiple threads properly.