Apple has released iOS 13.2.2 and iPadOS 13.2.2. Go to Settings > General > Software Update on your iPhone and/or iPad to install them.
The updates resolve a glitch in which apps quit when running in the background, and other issues. Also, according to Apple’s release notes, iOS 13.2.2:
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Fixes an issue that could cause apps to quit unexpectedly when running in the background;
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Resolves an issue where iPhone may temporarily lose mobile signal after a call;
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Addresses an issue where mobile data may temporarily not be available;
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Fixes an issue that caused replies to S/MIME encrypted email messages between Exchange accounts to be unreadable;
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Addresses an issue where using Kerberos single sign-on service in Safari may present an authentication prompt;
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Resolves an issue where charging may be interrupted on YubiKey Lightning-powered accessories.
iPadOS 13.2.2 addresses all the above expect for the cellular issues fix.