Had this problem and found this thread which has been very useful so thanks folks. Recently moved from an old S4 to an A41 with Android 10 and got this problem i.e. when I leave the house and drop the wifi connection I don't automatically get data over mobile network. My first fix was simply to restart the phone and this worked. I then read this thread and particularly the note about APN authentication type. The default setting on the Internet APN setup on my phone was PAP. I setup a new connection and left it 'not set' and then switched to this connection and all is working OK. I'm in the UK using BT/EE network.
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