Thanks everyone for your input. Something weird happened this morning. When I turned on my G2, the screen showed the attached. I waited for 10 minutes, nothing happened so I turned it off. Miraculously and coincidentally , the speaker and sound is back to normal.
I love my device so much, always use SVoice for texting, taking calls, making appointments, voice memos, etc. Perhaps the problem had to do with the over usage of SVoice? The only time I use my main device, SG5 is for web browse, video, and email.
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