Have you tried rebooting the phone to see if that makes a difference. Also sounds like you have a run-away app.Not sure if there's anyone that has this problem but since 13.2.3 i have an issue that, for example, when i am at home and use wifi and then i leave home, no one can call me, the data is not working i can't send a message via iMessage or SMS to anyone even though it keeps showing that i have 3-4 bars of LTE. I have to turn on and off the airplane mode for it to start working.
The first time i was trying to send messages via iMessage while having 3 bars of LTE and it didn't want to send so i thought that maybe there are problems with the carrier but one day i left home and was suprised that i haven't received a single notification for around 3 hours (i mostly get few calls, mails, messages and instagram notifications) just to see how many notifications i received when connected to wifi. Also, the next day i got a call from few people that they tried to call me.
I updated to 13.3 b3 and now to the final version hoping that it will fix it but no, it's still here and it's not a carrier issue since they already told me that they don't have any issue with cellular, moreover my friends that use 6s and XS and are on the same carrier, don't have any of those problems.
The phone i use is iPhone X with Intel modem but i didn't have any of these issues while using iOS 11 or 12 so they must have done something with 13.2.3 and up.
*the good thing about 13.3 is that it feels smoother than 13.2.3 but the battery life is trash and it's been since 12.4, i miss the battery life i was getting on 12.3
You could also try to "reset all network settings".
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Reboot you phone and see if that helps.Anyone have any ideas how to fix this? Or what to try? (Only effects non-apple third party apps it seems. Apple apps like Safari, camera, etc work fine)
Also noticed battery is being drained at an alarming speed. Just typing this message has dropped 1% of power.