Kitchen Timer
This instructions will help you to fix app background work on some devices.
More information you can find on https://dontkillmyapp.com/
Android 9.0: disable battery optimization for app
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Samsung: turn off battery optimization for app
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If you don't have previous settings try this:
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LG: ignore optimization for app
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Huawei: ignore optimization
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Xiaomi: add to no restrictions
Go to settings > battery > manage apps’ battery usage
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