Hi @nagezukie ,
Perhaps the battery is failing and needs to be replaced.
I couldn’t find an EWA A106 teardown guide online but was thinking that the [https://www.youtube.com/watch?v=uvQzShLCqBI|EWA A110 battery replacement guide] may be of some help if they are of a similar construction design.
Here’s an image taken from 1:53 minutes into the video that shows the battery.
[image|2163804]
(click on image to enlarge for better viewing)
I cannot see it to well but the 6 digit number I’ve highlighted on the image shows the dimensions (I think) of the battery. The convention with battery dimension numbering is that the first two digits are the depth of the battery in mm, with a decimal point between that is ''not'' shown. The next two digits are the width in mm and the last two digits are the length in mm. An example would be 304040 = 3.0mm D x 40mm W x 40mm L.
As it can be charged via USB, it will mean that is should be a 3.7V battery.
If you can access the battery, use the dimensions number printed on it and search online for ''(insert number) 3.7V LiPo battery'' to hopefully find a compatible replacement battery that will physically fit into the speaker and also doesn’t cost too much