1. Force close Safari or Bing application. https://support.apple.com/en-us/HT201330
2 Clear History Caches and Website Data. https://support.apple.com/en-us/HT201265
3. Settings > Safari or Bing > Search
Turn off Search Engine Suggestions,
Safari Suggestions,
Quick Website Search
and
Preload Top Hit.
Note: This may be same for Bing.
4. Highlight and delete the entry in the Safari’s or Bing's search bar.
Press spacebar key on the keyboard twice.
Enter the URL for the site manually and then “Go”.
Test for a while.
Repeat step 4 for all sites that manifest the problem.
After a while, re-enable those disabled search engine options.
https://www.youtube.com/watch?v=NDeb7XGaiWc