After phone call phone lose network on Mi11T


Feb 14, 2022
from the first day I buy xiaomi 11T After i finish regular phone call to any other persons my phone lost regular network for 10-50 seconds and I can make any call only 112 call. phone show no network.
After 10-50 seconds it back to normal i try to change phone setting from 4G to 3G and on 3G i get this issues not so often but still same.
I try to change sim card to new one but it don't help
Maybe some one else have same and know how to fix it