I am just quoting Yamaha. The TA can be turned off. Its got no comparison to rebooting PCs. You most likely get the sound because you have not turned the TA off and its reacting to other frequencies and vibrations in the vicinity. ie doing what it is designed to do.
If I forget to turn off my normal guitar connected to an amp and go to the bathroom and come back will that happen? NO
Imagine you are playing in cafe , you forget to turn this off and you leave your seat for a moment the whole place will be in chaos.
There’s your answer.
The easy solution is not to forget to turn it off when not in use 
My advice for the future would be to research the guitar(s) you are interested in before buying them on a whim and then regretting the purchase.
OK , I went to store I picked up 3 guitars one was Yamaha acoustic guitar
one was Martin D10e-02 ( cheap one) and another not sure what the model was but more expensive Taylor guitar.
I liked these 3 guitars but this time I asked the guy to play the same music and I did not look at the guitars. I told him I choose the one that the sound is pleasing to my ear without looking at the brand and price.
Man I loved the sound of the cheap Martin D10e-02 and now it is with me.
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