Please tell us some basic information before asking for help:
Model Name: 6 pro
Rooted or not: no
Frequency of Occurrence: often
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
If Im listening to something like YouTube music on WiFi and leave WiFi zone the phone doesn't auto connect to cellular network. It gives me an error about WiFi being connected still but no Internet. I have to manually turn off wifi to get it to connect to the cell network.
This of course stops any stream i had playing. This only occurs with something actively using data and it's not an always occurrence.