This is an old thread but in case anyone stumpled upon it, this issue happened to my Sony Xperia XA last night. I had no idea why it suddenly wouldn’t catch network signal. I rebooted my phone many times but it didn’t work. Then, I remembered that I set my preferred network type to LTE only. When I changed it back to LTE preferred/WCDMA/GSM, it worked perfectly fine again. Hope his helps.
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