Yes, I know it is in the case. You have to eliminate issues, form what I can see, it is probably an issue with the HDD. Instead of formatting/initialising it, easier to disconnect it. You can leave it in case, just remove power/sata cable.
If you look at your log using a linux compatible text editor like notepad++ (not windows notepad), that timeshift issue keeps recurring. You said timeshift is disabled, but it is in the log. Unless you are pressing pause before changing channels.