MacBook Pro has kernel panic same time every time I purchased a second hand MacBook Pro 2015 and installed High Sierra on it and upgraded the SSD. Every day between 5-6pm it has a kernel panic and restarts. Any idea what might be behind this? I can't identify an activity trigger and its been happening daily for about 6 months.
This panic signature reminds me of a panic I saw a while back that was caused by Norton AntiVirus, which you have installed. In fact, here is someone on the Norton forum seeing the same thing. It's possible that you have a daily scan in the 5-6pm timeframe which hits this bug.

If you’re not already running the latest version of Norton AntiVirus, update to the latest.
If you are on the latest version and this panic continues to happen, uninstall Norton AntiVirus. Specifically, this means making sure that its four kernel extensions are uninstalled. You can verify via kextstat | grep com.symantec.
If the panic continues after uninstalling Norton, uninstall your other KEXTs (Black Magic, Soundflower, SoundGrabber).
If panics continue, we can start to debug them by adding symbolication to your panic output: Disable SIP, run sudo nvram boot-args=&quot;kextsyms=1&quot;, reboot, and collect &amp; upload a new panic report.