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It's not abnormal, but it really depends on how often it happens. If the app restarts every couple of seconds, you probably have an issue - either not enough free memory on your phone, or a specific bug with your version of TikTok. Before blaming the app, I'd suggest checking how much storage space you have left and seeing if you've got other memory-hungry apps running in the background.
One thing people often forget: TikTok builds up a huge cache over time. Try clearing the app's cache directly from your phone's settings (don't uninstall it, just clear the cache). That fixes the problem in a lot of cases. If it keeps happening after that, then yeah, it's worth doing a clean reinstall.
Yes, that's totally normal! The app needs to restart to load new videos, check notifications, and manage memory without crashing.
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