Thank you for those extra screenshots 1_H,
Does this error pop up only when using a specific app? If so, we would encourage you to reach out to the app developer directly. They will be experts in troubleshooting their apps, and how they interact with your iPhone: Contact a third-party vendor - Apple Support
If you're using Safari, we can recommend following the steps outlined in the Apple Support article If Safari isn't loading websites or quits on your iPhone, iPad, or iPod touch - Apple Support, which targets a variety of issues with Safari.
Should you continue to need additional assistance after that, Apple Support will be best equipped to continue the investigation. You can reach them here: Get Support
Have a great weekend.