LTE issue in Pixel

Google is claiming that after 7.1.2. update they have fixed the LTE issue with Band 4. I must say to you that the phone is not staying at LTE signal at all. It drops back to HSPA+. Please help me. I was using Nexus 6P (Android 7.1.2.), in that I had no issues regarding LTE. Checked with my carrier, everything is fine with them.
Purchasing a premium phone and getting this LTE issue, feeling like I have being conned by Google.
Please help me. Please

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