There are a couple of ways to deal with this problem. The most common solution to deal with this problem is to close completely close other open apps. You can do this by tapping the task screen button located next to the home and back buttons. Then, close all the apps by swyping left or right for each of the apps you are not using.
If that does not solve the problem, you could check the Lenovo tab S8 troubleshooting guide [[Lenovo Tab S8 Troubleshooting|here.]]