LG V 20 signal problem

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Android Central Question

Good Day,
Dear Fellows,
I have LG V 20 (H918). I have two problem that:
1. When I switch my phone to 2G mode/GSM mode Only, the signals disappear immediate & a small circle appears in signals showing searching/emergency calls. It only works in LTE/WCDMA/GSM, GSM/WCDMA, LTE, WCDMA, WCDMA only, LTE Only mode, not working in GSM mode only as mention above.
2. Secondly, my network keep dropping signal when I make call to somebody & if got full bars by making call it suddenly drops to one bar or two.
I am quite confused about the problem. Is it antenna fault or software problem
Plz help me out. I shall be highly obliged for suggestions.
 
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