Some app disabling the phone's microphone?

I had a LG G2 for a few years. Last year I installed lots of children apps on it to keep our todder busy during trips. At some point, the phone's mic stopped working properly. When I made a call, I could hear the other party but they couldn't hear me, unless I switched to "Speaker" mode. So I figured its an old phone and the mic broke or something and just shrugged it off and whenever I got a call or made a call I used "Speaker" mode which was kinda inconvenient but tolerable.

Anyway fast...

Some app disabling the phone's microphone?

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