had the same problem and was able to solve it:[br]
I disassembled more or less the whole speaker (use the right screwdrivers, not to mess up the screws) following some youtube vids. [br]
I found two problems for the buttons not working and solved them like this: [br]
1) The flat cable connecting the buttons with the circuit board tends to slip out of its “gripper” on the PCB. [br]
I slid it back in, closed the gripper and put a little tape on top[br]
2) The Bluetooth button tends to get stuck, wich causes the power button not to work any more. To solve this I opened the ruber cover between PCB and outside cover. There is a white/transparent plastic piece attached below, that has the same function like a “rubber dome” in a keyboard. It has two little noses on its bottom to push on the buttons on the PCB (power and Bluetooth). I cut off a part of the bluetooths nose, to give the button on the PCB more space to come up again. Obviously dont cut off too much… [br]
after reassembling everything works as it should again and Im happy.