[問題] 為什麼網路常常從4g切換成3g?
如題，但也不是沒4g訊號
常常要手動切成4g
方法是先在設定-行動網路 轉成2g
訊號會消失一陣子再馬上切回4g
這時候就會有4g可以用
http://i.imgur.com/chn0qPc.jpg
但是常常這樣搞很麻煩，為什麼會這樣？
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