Hey there, and welcome to Apple Support Communities Creamynol12,
We can certainly understand your concern and are here to help as much as we can.
We would like to ask you a couple of questions in order to get a better understanding. First, what exact version of iOS are you currently using? We ask as the menus and options can change slightly between versions of iOS, and we want to make sure we provide the most accurate steps. You can locate this by going to Settings > General > About. Also, does this issue happen only with TikTok or other applications? Finally, are there any other applications running in background when using TikTok?
If you have updated your device to the latest iOS (15.6) and the issue is only with TikTok. Then the best next step would be to contact TikTok for additional assistance. Check out these steps on how to contact an app developer.
" When to contact an app developer for help
- If an app isn't working, but the issue doesn't affect other apps.
- If you can't use an in-app purchase, such as a bonus game level or "remove ads."
Contact the developer of an iOS, iPadOS, or watchOS app
- Open the App Store on your iPhone, iPad, or iPod touch.
- Search for the app, then tap it. If you can't find it, tap the account button
or your photo at the top of the screen, tap Purchased, tap "Not on this [device]," then tap the app. - The app's product page appears. Scroll to the Ratings & Reviews section, then tap App Support. If you don't see App Support, make sure that you're signed in with the correct Apple ID. "
For additional information, check out this link: How to contact an app developer - Apple Support
Kindest regards!