texting and glass repair issues on ipad mini

Clarification please -

Are you referring to SMS texts (green bubbles) or iMessage (blue bubbles) or both?

Try a forced restart after shutting down all open apps using the app switcher - invoked by quick double press of the home button and swiping up on each app till it flies off the screen

Hold the sleep/wake and home buttons down together till you see  logo - then release and allow normal boot up

Re pairing the iDevice may help

Use Continuity to connect your iPhone, iPad, iPod touch, and Mac - Apple Support

Can you also tell us how you had the screen replaced? iPad Screen Damage - Official Apple Support ??

I fear then that you may have an inferior replacement part - Apple will detect that f you take it to them and refuse service.

The part may not be at fault, no way of telling for sure without a much more detailed description of your issue.