iPhone x stuck on searching or no service after display replacement

i replaced my battery and display on my phone 3 months and ago and just did another display replacement upon checking the phone was stuck in searching even if the sim card was ejected, tried a hard reset and got the phone to recognize sim after 30 minutes but still no service, no matter how many hard resets i did only one of these will happen, i tried factory resetting but still shows the same issue, i cant get it to dfu restore as the phone tends to boot up back into normal after 30 seconds going into dfu mode